八年级下册数学学什么内容？ 八年级下册数学计算题目及答案人教版？

八年级下册数学所学什么？

人教版八年级 数学下册包括以下内容:第16章二次根式，共三节，16.1二次根式；16.2二次根式的乘除；16.3二次根式的加减。第17章勾股定理，共2节，17.1勾股定理；17.2勾股定理的逆定理。第18章平行四边形，共2节，18.1平行四边形；18.2特殊的平行四边形。第19章一次函数，共3节，19.1函数；19.2一次函数；19.3课题学习，选择方案。第20章数据的分析，共3节，20.1数据的集中趋势；20.2数据的波动成度；20.3课题学习，体质健康测试中的数据分析

八年级下册数学比较难计算题的试题？

1) 66x+17y=3967

 

25x+y=1200

 

答案：x=48 y=47

 

(2) 18x+23y=2303

 

74x-y=1998

 

答案：x=27 y=79

 

(3) 44x+90y=7796

 

44x+y=3476

 

答案：x=79 y=48

 

(4) 76x-66y=4082

 

30x-y=2940

 

答案：x=98 y=51

 

(5) 67x+54y=8546

 

71x-y=5680

 

答案：x=80 y=59

 

(6) 42x-95y=-1410

 

21x-y=1575

 

答案：x=75 y=48

 

(7) 47x-40y=853

 

34x-y=2006

 

答案：x=59 y=48

 

(8) 19x-32y=-1786

 

75x+y=4950

 

答案：x=66 y=95

 

(9) 97x+24y=7202

 

58x-y=2900

 

答案：x=50 y=98

 

(10) 42x+85y=6362

 

63x-y=1638

 

答案：x=26 y=62

 

(11) 85x-92y=-2518

 

27x-y=486

 

答案：x=18 y=44

 

(12) 79x+40y=2419

 

56x-y=1176

 

答案：x=21 y=19

 

(13) 80x-87y=2156

 

22x-y=880

 

答案：x=40 y=12

 

(14) 32x+62y=5134

 

57x+y=2850

 

答案：x=50 y=57

 

(15) 83x-49y=82

 

59x+y=2183

 

答案：x=37 y=61

 

(16) 91x+70y=5845

 

95x-y=4275

 

答案：x=45 y=25

 

(17) 29x+44y=5281

 

88x-y=3608

 

答案：x=41 y=93

 

(18) 25x-95y=-4355

 

40x-y=2000

 

答案：x=50 y=59

 

(19) 54x+68y=3284

 

78x+y=1404

 

答案：x=18 y=34

 

(20) 70x+13y=3520

 

52x+y=2132

 

答案：x=41 y=50

 

(21) 48x-54y=-3186

 

24x+y=1080

 

答案：x=45 y=99

 

(22) 36x+77y=7619

 

47x-y=799

 

答案：x=17 y=91

 

(23) 13x-42y=-2717

 

31x-y=1333

 

答案：x=43 y=78

 

(24) 28x+28y=3332

 

52x-y=4628

 

答案：x=89 y=30

 

(25) 62x-98y=-2564

 

46x-y=2024

 

答案：x=44 y=54

 

(26) 79x-76y=-4388

 

26x-y=832

 

答案：x=32 y=91

 

(27) 63x-40y=-821

 

42x-y=546

 

答案：x=13 y=41

 

(28) 69x-96y=-1209

 

42x+y=3822

 

答案：x=91 y=78

 

(29) 85x+67y=7338

 

11x+y=308

 

答案：x=28 y=74

 

(30) 78x+74y=12928

 

14x+y=1218

 

答案：x=87 y=83

 

(31) 39x+42y=5331

 

59x-y=5841

 

答案：x=99 y=35

 

(32) 29x+18y=1916

 

58x+y=2320

 

答案：x=40 y=42

 

(33) 40x+31y=6043

 

45x-y=3555

 

答案：x=79 y=93

 

(34) 47x+50y=8598

 

45x+y=3780

 

答案：x=84 y=93

 

(35) 45x-30y=-1455

 

29x-y=725

 

答案：x=25 y=86

 

(36) 11x-43y=-1361

 

47x+y=799

 

答案：x=17 y=36

 

(37) 33x+59y=3254

 

94x+y=1034

 

答案：x=11 y=49

 

(38) 89x-74y=-2735

 

68x+y=1020

 

答案：x=15 y=55

 

(39) 94x+71y=7517

 

78x+y=3822

 

答案：x=49 y=41

 

(40) 28x-62y=-4934

 

46x+y=552

 

答案：x=12 y=85

 

(41) 75x+43y=8472

 

17x-y=1394

 

答案：x=82 y=54

 

(42) 41x-38y=-1180

 

29x+y=1450

 

答案：x=50 y=85

 

(43) 22x-59y=824

 

63x+y=4725

 

答案：x=75 y=14

 

(44) 95x-56y=-401

 

90x+y=1530

 

答案：x=17 y=36

 

(45) 93x-52y=-852

 

29x+y=464

 

答案：x=16 y=45

 

(46) 93x+12y=8823

 

54x+y=4914

 

答案：x=91 y=30

 

(47) 21x-63y=84

 

20x+y=1880

 

答案：x=94 y=30

 

(48) 48x+93y=9756

 

38x-y=950

 

答案：x=25 y=92

 

(49) 99x-67y=4011

 

75x-y=5475

 

答案：x=73 y=48

 

(50) 83x+64y=9291

 

90x-y=3690

 

答案：x=41 y=92

 

(51) 17x+62y=3216

 

75x-y=7350

 

答案：x=98 y=25

 

(52) 77x+67y=2739

 

14x-y=364

 

答案：x=26 y=11

 

(53) 20x-68y=-4596

 

14x-y=924

 

答案：x=66 y=87

 

(54) 23x+87y=4110

 

83x-y=5727

 

答案：x=69 y=29

 

(55) 22x-38y=804

 

86x+y=6708

 

答案：x=78 y=24

 

(56) 20x-45y=-3520

 

56x+y=728

 

答案：x=13 y=84

 

(57) 46x+37y=7085

 

61x-y=4636

 

答案：x=76 y=97

 

(58) 17x+61y=4088

 

71x+y=5609

 

答案：x=79 y=45

 

(59) 51x-61y=-1907

 

89x-y=2314

 

答案：x=26 y=53

 

(60) 69x-98y=-2404

 

21x+y=1386

 

答案：x=66 y=71

 

(61) 15x-41y=754

 

74x-y=6956

 

答案：x=94 y=16

 

(62) 78x-55y=656

 

89x+y=5518

 

答案：x=62 y=76

 

(63) 29x+21y=1633

 

31x-y=713

 

答案：x=23 y=46

 

(64) 58x-28y=2724

 

35x+y=3080

 

答案：x=88 y=85

 

(65) 28x-63y=-2254

 

88x-y=2024

 

答案：x=23 y=46

 

(66) 43x+50y=7064

 

85x+y=8330

 

答案：x=98 y=57

 

(67) 58x-77y=1170

 

38x-y=2280

 

答案：x=60 y=30

 

(68) 92x+83y=11586

 

43x+y=3010

 

答案：x=70 y=62

 

(69) 99x+82y=6055

 

52x-y=1716

 

答案：x=33 y=34

 

(70) 15x+26y=1729

 

94x+y=8554

 

答案：x=91 y=14

 

(71) 64x+32y=3552

 

56x-y=2296

 

答案：x=41 y=29

 

(72) 94x+66y=10524

 

84x-y=7812

 

答案：x=93 y=27

 

(73) 65x-79y=-5815

 

89x+y=2314

 

答案：x=26 y=95

 

(74) 96x+54y=6216

 

63x-y=1953

 

答案：x=31 y=60

 

(75) 60x-44y=-352

 

33x-y=1452

 

答案：x=44 y=68

 

(76) 79x-45y=510

 

14x-y=840

 

答案：x=60 y=94

 

(77) 29x-35y=-218

 

59x-y=4897

 

答案：x=83 y=75

 

(78) 33x-24y=1905

 

30x+y=2670

 

答案：x=89 y=43

 

(79) 61x+94y=11800

 

93x+y=5952

 

答案：x=64 y=84

 

(80) 61x+90y=5001

 

48x+y=2448

 

答案：x=51 y=21

 

(81) 93x-19y=2

 

86x-y=1548

 

答案：x=18 y=88

 

(82) 19x-96y=-5910

 

30x-y=2340

 

答案：x=78 y=77

 

(83) 80x+74y=8088

 

96x-y=8640

 

答案：x=90 y=12

 

(84) 53x-94y=1946

 

45x+y=2610

 

答案：x=58 y=12

 

(85) 93x+12y=9117

 

28x-y=2492

 

答案：x=89 y=70

 

(86) 66x-71y=-1673

 

99x-y=7821

 

答案：x=79 y=97

 

(87) 43x-52y=-1742

 

76x+y=1976

 

答案：x=26 y=55

 

(88) 70x+35y=8295

 

40x+y=2920

 

答案：x=73 y=91

 

(89) 43x+82y=4757

 

11x+y=231

 

答案：x=21 y=47

 

(90) 12x-19y=236

 

95x-y=7885

 

答案：x=83 y=40

 

(91) 51x+99y=8031

 

71x-y=2911

 

答案：x=41 y=60

 

(92) 37x+74y=4403

 

69x-y=6003

 

答案：x=87 y=16

 

(93) 46x+34y=4820

 

71x-y=5183

 

答案：x=73 y=43

 

(94) 47x+98y=5861

 

55x-y=4565

 

答案：x=83 y=20

 

(95) 30x-17y=239

 

28x+y=1064

 

答案：x=38 y=53

 

(96) 55x-12y=4112

 

79x-y=7268

 

答案：x=92 y=79

 

(97) 27x-24y=-450

 

67x-y=3886

 

答案：x=58 y=84

 

(98) 97x+23y=8119

 

14x+y=966

 

答案：x=69 y=62

 

(99) 84x+53y=11275

 

70x+y=6790

 

答案：x=97 y=59

 

(100) 51x-97y=297

 

19x-y=1520

 

答案：x=80 y=39

八年级下册数学比较难计算题的试题？

1) 66x+17y=3967

 

25x+y=1200

 

答案：x=48 y=47

 

(2) 18x+23y=2303

 

74x-y=1998

 

答案：x=27 y=79

 

(3) 44x+90y=7796

 

44x+y=3476

 

答案：x=79 y=48

 

(4) 76x-66y=4082

 

30x-y=2940

 

答案：x=98 y=51

 

(5) 67x+54y=8546

 

71x-y=5680

 

答案：x=80 y=59

 

(6) 42x-95y=-1410

 

21x-y=1575

 

答案：x=75 y=48

 

(7) 47x-40y=853

 

34x-y=2006

 

答案：x=59 y=48

 

(8) 19x-32y=-1786

 

75x+y=4950

 

答案：x=66 y=95

 

(9) 97x+24y=7202

 

58x-y=2900

 

答案：x=50 y=98

 

(10) 42x+85y=6362

 

63x-y=1638

 

答案：x=26 y=62

 

(11) 85x-92y=-2518

 

27x-y=486

 

答案：x=18 y=44

 

(12) 79x+40y=2419

 

56x-y=1176

 

答案：x=21 y=19

 

(13) 80x-87y=2156

 

22x-y=880

 

答案：x=40 y=12

 

(14) 32x+62y=5134

 

57x+y=2850

 

答案：x=50 y=57

 

(15) 83x-49y=82

 

59x+y=2183

 

答案：x=37 y=61

 

(16) 91x+70y=5845

 

95x-y=4275

 

答案：x=45 y=25

 

(17) 29x+44y=5281

 

88x-y=3608

 

答案：x=41 y=93

 

(18) 25x-95y=-4355

 

40x-y=2000

 

答案：x=50 y=59

 

(19) 54x+68y=3284

 

78x+y=1404

 

答案：x=18 y=34

 

(20) 70x+13y=3520

 

52x+y=2132

 

答案：x=41 y=50

 

(21) 48x-54y=-3186

 

24x+y=1080

 

答案：x=45 y=99

 

(22) 36x+77y=7619

 

47x-y=799

 

答案：x=17 y=91

 

(23) 13x-42y=-2717

 

31x-y=1333

 

答案：x=43 y=78

 

(24) 28x+28y=3332

 

52x-y=4628

 

答案：x=89 y=30

 

(25) 62x-98y=-2564

 

46x-y=2024

 

答案：x=44 y=54

 

(26) 79x-76y=-4388

 

26x-y=832

 

答案：x=32 y=91

 

(27) 63x-40y=-821

 

42x-y=546

 

答案：x=13 y=41

 

(28) 69x-96y=-1209

 

42x+y=3822

 

答案：x=91 y=78

 

(29) 85x+67y=7338

 

11x+y=308

 

答案：x=28 y=74

 

(30) 78x+74y=12928

 

14x+y=1218

 

答案：x=87 y=83

 

(31) 39x+42y=5331

 

59x-y=5841

 

答案：x=99 y=35

 

(32) 29x+18y=1916

 

58x+y=2320

 

答案：x=40 y=42

 

(33) 40x+31y=6043

 

45x-y=3555

 

答案：x=79 y=93

 

(34) 47x+50y=8598

 

45x+y=3780

 

答案：x=84 y=93

 

(35) 45x-30y=-1455

 

29x-y=725

 

答案：x=25 y=86

 

(36) 11x-43y=-1361

 

47x+y=799

 

答案：x=17 y=36

 

(37) 33x+59y=3254

 

94x+y=1034

 

答案：x=11 y=49

 

(38) 89x-74y=-2735

 

68x+y=1020

 

答案：x=15 y=55

 

(39) 94x+71y=7517

 

78x+y=3822

 

答案：x=49 y=41

 

(40) 28x-62y=-4934

 

46x+y=552

 

答案：x=12 y=85

 

(41) 75x+43y=8472

 

17x-y=1394

 

答案：x=82 y=54

 

(42) 41x-38y=-1180

 

29x+y=1450

 

答案：x=50 y=85

 

(43) 22x-59y=824

 

63x+y=4725

 

答案：x=75 y=14

 

(44) 95x-56y=-401

 

90x+y=1530

 

答案：x=17 y=36

 

(45) 93x-52y=-852

 

29x+y=464

 

答案：x=16 y=45

 

(46) 93x+12y=8823

 

54x+y=4914

 

答案：x=91 y=30

 

(47) 21x-63y=84

 

20x+y=1880

 

答案：x=94 y=30

 

(48) 48x+93y=9756

 

38x-y=950

 

答案：x=25 y=92

 

(49) 99x-67y=4011

 

75x-y=5475

 

答案：x=73 y=48

 

(50) 83x+64y=9291

 

90x-y=3690

 

答案：x=41 y=92

 

(51) 17x+62y=3216

 

75x-y=7350

 

答案：x=98 y=25

 

(52) 77x+67y=2739

 

14x-y=364

 

答案：x=26 y=11

 

(53) 20x-68y=-4596

 

14x-y=924

 

答案：x=66 y=87

 

(54) 23x+87y=4110

 

83x-y=5727

 

答案：x=69 y=29

 

(55) 22x-38y=804

 

86x+y=6708

 

答案：x=78 y=24

 

(56) 20x-45y=-3520

 

56x+y=728

 

答案：x=13 y=84

 

(57) 46x+37y=7085

 

61x-y=4636

 

答案：x=76 y=97

 

(58) 17x+61y=4088

 

71x+y=5609

 

答案：x=79 y=45

 

(59) 51x-61y=-1907

 

89x-y=2314

 

答案：x=26 y=53

 

(60) 69x-98y=-2404

 

21x+y=1386

 

答案：x=66 y=71

 

(61) 15x-41y=754

 

74x-y=6956

 

答案：x=94 y=16

 

(62) 78x-55y=656

 

89x+y=5518

 

答案：x=62 y=76

 

(63) 29x+21y=1633

 

31x-y=713

 

答案：x=23 y=46

 

(64) 58x-28y=2724

 

35x+y=3080

 

答案：x=88 y=85

 

(65) 28x-63y=-2254

 

88x-y=2024

 

答案：x=23 y=46

 

(66) 43x+50y=7064

 

85x+y=8330

 

答案：x=98 y=57

 

(67) 58x-77y=1170

 

38x-y=2280

 

答案：x=60 y=30

 

(68) 92x+83y=11586

 

43x+y=3010

 

答案：x=70 y=62

 

(69) 99x+82y=6055

 

52x-y=1716

 

答案：x=33 y=34

 

(70) 15x+26y=1729

 

94x+y=8554

 

答案：x=91 y=14

 

(71) 64x+32y=3552

 

56x-y=2296

 

答案：x=41 y=29

 

(72) 94x+66y=10524

 

84x-y=7812

 

答案：x=93 y=27

 

(73) 65x-79y=-5815

 

89x+y=2314

 

答案：x=26 y=95

 

(74) 96x+54y=6216

 

63x-y=1953

 

答案：x=31 y=60

 

(75) 60x-44y=-352

 

33x-y=1452

 

答案：x=44 y=68

 

(76) 79x-45y=510

 

14x-y=840

 

答案：x=60 y=94

 

(77) 29x-35y=-218

 

59x-y=4897

 

答案：x=83 y=75

 

(78) 33x-24y=1905

 

30x+y=2670

 

答案：x=89 y=43

 

(79) 61x+94y=11800

 

93x+y=5952

 

答案：x=64 y=84

 

(80) 61x+90y=5001

 

48x+y=2448

 

答案：x=51 y=21

 

(81) 93x-19y=2

 

86x-y=1548

 

答案：x=18 y=88

 

(82) 19x-96y=-5910

 

30x-y=2340

 

答案：x=78 y=77

 

(83) 80x+74y=8088

 

96x-y=8640

 

答案：x=90 y=12

 

(84) 53x-94y=1946

 

45x+y=2610

 

答案：x=58 y=12

 

(85) 93x+12y=9117

 

28x-y=2492

 

答案：x=89 y=70

 

(86) 66x-71y=-1673

 

99x-y=7821

 

答案：x=79 y=97

 

(87) 43x-52y=-1742

 

76x+y=1976

 

答案：x=26 y=55

 

(88) 70x+35y=8295

 

40x+y=2920

 

答案：x=73 y=91

 

(89) 43x+82y=4757

 

11x+y=231

 

答案：x=21 y=47

 

(90) 12x-19y=236

 

95x-y=7885

 

答案：x=83 y=40

 

(91) 51x+99y=8031

 

71x-y=2911

 

答案：x=41 y=60

 

(92) 37x+74y=4403

 

69x-y=6003

 

答案：x=87 y=16

 

(93) 46x+34y=4820

 

71x-y=5183

 

答案：x=73 y=43

 

(94) 47x+98y=5861

 

55x-y=4565

 

答案：x=83 y=20

 

(95) 30x-17y=239

 

28x+y=1064

 

答案：x=38 y=53

 

(96) 55x-12y=4112

 

79x-y=7268

 

答案：x=92 y=79

 

(97) 27x-24y=-450

 

67x-y=3886

 

答案：x=58 y=84

 

(98) 97x+23y=8119

 

14x+y=966

 

答案：x=69 y=62

 

(99) 84x+53y=11275

 

70x+y=6790

 

答案：x=97 y=59

 

(100) 51x-97y=297

 

19x-y=1520

 

答案：x=80 y=39