150到二元一次方程组,过程加答案

初一的,越简单越好

(1)x+y=1 ①
2x-y=5 ②
解:①+②得:3x=6 x=2
将x=2代入①中得:y=-1
解得这个方程组的解为: x=2 y=-1
(2)x+3y=6 ①
2x-3y=6 ②
解:①+②得:3x=12 x=4
将x=4代入①中得:3y=6-4 y=2/3
解得这个方程组的解为: x=4 y=2/3
(3) 2x-y=3 ①
2x+2y=6 ②
解:②-①得:3y=3 y=1
将y=1代入①中得:2x=3+1 x=2
解得这个方程组的解为: x=2 y=1
(4) 2x-y=6 ①
2x+2y=3 ②
解:②-①得:3y=-3 y=-1
将y=-1代入①中得: 2x=5 x=5/2
解得这个方程组的解为: x=5/2 y=-1
(5 ) 2x-y=1 ①
x+y=5 ②
解:②+①得:3x=6 x=2
将x=2代入①中得:-y=-3 y=3
解得这个方程组的解为: x=2 y=3
(6 ) x+3y=3 ①
2x-3y=12 ②
解:②+①得: 3x=15 x=5
将x=5代入①中得: 3y=-2 y=-2/3
解得这个方程组的解为: x=5 y=-2/3
(7 ) x+3y=12 ①
2x-3y=3 ②
解:②+①得:3x=15 x=5
将x=5代入①中得:3y=7 y=7/3
解得这个方程组的解为: x=5 y=7/3
( 8) x+3y=12 ①
x-y=3 ②
解:①-②得:4y=15 y=15/4
将y=15/4代入②中得:x=27/4
解得这个方程组的解为:x=27/4 y=15/4
(9) x-y=3 ①
3x-8y=14 ②
解:由①×3得:3x-3y=9 ③
②-③得:-5y=5 y=-1
将y=-1代入①中得:x=2
解得这个方程组的解为:x=2 y=-1
(10) y=2x-3 ①
3x+2y=8 ②
将①代入②中得:3x+2( 2x-3 ) = 8 x=2
将x=2代入①中得:y=1
解得这个方程组的解为:x=2 y=1
(11) 2x-y=5 ①
3x-y=8 ②
解:①-②得: -x=-3 x=3
将x=-3代入①中得:-y=11 y=-11
解得这个方程组的解为:x=3 y=-11
(12) x+y=10 ①
2x+y=16 ②
解:②-①得:x=6
把x=6 代入①得:y=4
解得这个方程组的解为: x=6 y=4
(13) x+2y=12 ①
3x-2y=4 ②
解:①+②得:4x=16 x=4
将:x=4代入①中得: 2y=8 y=4
解得这个方程组的解为: x=4 y=4
(14) x+2y=25 ①
x+4y=15 ②
解:②-①得:2y=-10 y=-5
把y=-5代入①中得:x=35
解得这个方程组的解为:x=35 y=-5
(15)2x+5y=8 ①
x+5y=3 ②
解:①-②得:x=5
将x=5代入②中得:5y=-2 y=-2/5
解得这个方程组的解为:x=5 y=-2/5
(16) 2x+3y=6 ①
2x+2y=-4 ②
解:①-②得 : y=10
将y=10代入②中得:2x=-24 x=-12
解得这个方程组的解为: x=-12 y=10
(17) 3x-y=5 ①
5x+2y=15 ②
解:①×2得: 6x+2y=10 ③
③-②得:x=-5
将x=-5代入①中得:y=-20
解得这个方程组的解为 : x=-5 y=-20
(18) x-2y=3 ①
x-3y=20 ②
解:①-②得:y=-17
将 y=-17代入①中得: x=37
解得这个方程组的解为:x=37 y=-17
(19) x-y=13 ①
x-6y=-7 ②
解:①-②得:5y=20 y=4
将y=4代入①中得:x=17
解得这个方程组的解为:x=17 y=4
(20) x-2y=4 ①
4x+2y=6 ②
解:①+②得:5x=10 x=2
将x=2代入①中得:-2y=2 y=-1
解得这个方程组的解为: x=2 y=-1
(21) 5x-y=110 ①
9y-x=110 ②
解:②×5得 : 45y-5x=550 ③
③+①得:44y=660 y=15
将y=15代入①中得:5x=125 x=25
解得这个方程组的解为 : x=25 y=15
(22)3x+y=11 ①
-4x-y=11 ②
解:①+②得:-x=22 x=-22
将x=-22代入①中得: y=77
解得这个方程组的解为:x=-22 y=77
(23)4x+y=15 ①
3y-4x=-3 ②
解:①+②得:4y=12 y=3
将y=3代入①中得:4x=12 x=3
解得这个方程组的解为:x=3 y=3
(24) 0.5x+3y=-6 ①
0.5x+y=2 ②
解:②-①得:-2y=8 y=-4
将y=-4代入②中得: 0.5x=6 x=12
解得这个方程组的解为: x=12 y=-4
(25) x+y=1 ①
3x+2y=5 ②
解: 由①得: x=1-y ③
将③代入②中得:3( 1-y ) +2y=5 y=-2
将y=-2代入①中得:x=3
解得这个方程组的解为:x=3 y=-2
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第1个回答  2016-08-03
1.2x+9y=81
3x+y=34
2.9x+4y=35
8x+3y=30
3.7x+2y=52
7x+4y=62
4.4x+6y=54
9x+2y=87
5.2x+y=7
2x+5y=19
6.x+2y=21
3x+5y=56
7.5x+7y=52
5x+2y=22
8.5x+5y=65
7x+7y=203
9.8x+4y=56
x+4y=21
10.5x+7y=41
5x+8y=44
11.7x+5y=54
3x+4y=38
12.x+8y=15
4x+y=29
13.3x+6y=24
9x+5y=46
14.9x+2y=62
4x+3y=36
15.9x+4y=46
7x+4y=42
16.9x+7y=135
4x+y=41
17.3x+8y=51
x+6y=27
18.9x+3y=99
4x+7y=95
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
21.8x+2y=28
7x+8y=62
22.x+6y=14
3x+3y=27
23.7x+4y=67
2x+8y=26
24.5x+4y=52
7x+6y=74
25.7x+y=9
4x+6y=16
26.6x+6y=48
6x+3y=42
27.8x+2y=16
7x+y=11
28.4x+9y=77
8x+6y=94
29.6x+8y=68
7x+6y=66
30.2x+2y=22
7x+2y=47
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
(4) 76x-66y=4082

30x-y=2940
(5) 67x+54y=8546

71x-y=5680
(6) 42x-95y=-1410

21x-y=1575
(7) 47x-40y=853

34x-y=2006
(8) 19x-32y=-1786

75x+y=4950
(9) 97x+24y=7202

58x-y=2900
(10) 42x+85y=6362

63x-y=1638
(11) 85x-92y=-2518

27x-y=486
(12) 79x+40y=2419

56x-y=1176
(13) 80x-87y=2156

22x-y=880
(14) 32x+62y=5134

57x+y=2850
(15) 83x-49y=82

59x+y=2183
(16) 91x+70y=5845

95x-y=4275
(17) 29x+44y=5281

88x-y=3608
(18) 25x-95y=-4355

40x-y=2000
(19) 54x+68y=3284

78x+y=1404
(20) 70x+13y=3520

52x+y=2132
(21) 48x-54y=-3186

24x+y=1080
(22) 36x+77y=7619

47x-y=799
(23) 13x-42y=-2717

31x-y=1333
(24) 28x+28y=3332

52x-y=4628
(25) 62x-98y=-2564

46x-y=2024
(26) 79x-76y=-4388

26x-y=832
(27) 63x-40y=-821

42x-y=546
(28) 69x-96y=-1209

42x+y=3822

(29) 85x+67y=7338
11x+y=308
(30) 78x+74y=12928

14x+y=1218

(31) 39x+42y=5331
59x-y=5841

(32) 29x+18y=1916
58x+y=2320

(33) 40x+31y=6043
45x-y=3555

(34) 47x+50y=8598
45x+y=3780

(35) 45x-30y=-1455
29x-y=725

(36) 11x-43y=-1361
47x+y=799

(37) 33x+59y=3254
94x+y=1034

(38) 89x-74y=-2735
68x+y=1020

(39) 94x+71y=7517
78x+y=3822

(40) 28x-62y=-4934
46x+y=552

(41) 75x+43y=8472
17x-y=1394

(42) 41x-38y=-1180
29x+y=1450

(43) 22x-59y=824
63x+y=4725

(44) 95x-56y=-401
90x+y=1530

(45) 93x-52y=-852
29x+y=464

(46) 93x+12y=8823
54x+y=4914

(47) 21x-63y=84
20x+y=1880

(48) 48x+93y=9756
38x-y=950

(49) 99x-67y=4011
75x-y=5475

(50) 83x+64y=9291
90x-y=3690

(51) 17x+62y=3216
75x-y=7350

(52) 77x+67y=2739
14x-y=364

(53) 20x-68y=-4596
14x-y=924

(54) 23x+87y=4110
83x-y=5727

(55) 22x-38y=804
86x+y=6708

(56) 20x-45y=-3520
56x+y=728

(57) 46x+37y=7085
61x-y=4636

(58) 17x+61y=4088
71x+y=5609

(59) 51x-61y=-1907
89x-y=2314

(60) 69x-98y=-2404
21x+y=1386

(61) 15x-41y=754
74x-y=6956

(62) 78x-55y=656
89x+y=5518

(63) 29x+21y=1633
31x-y=713

(64) 58x-28y=2724
35x+y=3080

(65) 28x-63y=-2254
88x-y=2024

(66) 43x+50y=7064
85x+y=8330

(67) 58x-77y=1170
38x-y=2280

(68) 92x+83y=11586
43x+y=3010

(69) 99x+82y=6055
52x-y=1716

(70) 15x+26y=1729
94x+y=8554

(71) 64x+32y=3552
56x-y=2296

(72) 94x+66y=10524
84x-y=7812

(73) 65x-79y=-5815
89x+y=2314

(74) 96x+54y=6216
63x-y=1953

(75) 60x-44y=-352
33x-y=1452

(76) 79x-45y=510
14x-y=840

(77) 29x-35y=-218
59x-y=4897

(78) 33x-24y=1905
30x+y=2670

(79) 61x+94y=11800
93x+y=5952

(80) 61x+90y=5001
48x+y=2448

(81) 93x-19y=2
86x-y=1548

(82) 19x-96y=-5910
30x-y=2340

(83) 80x+74y=8088
96x-y=8640

(84) 53x-94y=1946
45x+y=2610

(85) 93x+12y=9117
28x-y=2492

(86) 66x-71y=-1673
99x-y=7821

(87) 43x-52y=-1742
76x+y=1976

(88) 70x+35y=8295
40x+y=2920

(89) 43x+82y=4757
11x+y=231

(90) 12x-19y=236
95x-y=7885

(91) 51x+99y=8031
71x-y=2911

(92) 37x+74y=4403
69x-y=6003

(93) 46x+34y=4820
71x-y=5183

(94) 47x+98y=5861
55x-y=4565

(95) 30x-17y=239
28x+y=1064

(96) 55x-12y=4112
79x-y=7268

(97) 27x-24y=-450
67x-y=3886

(98) 97x+23y=8119
14x+y=966

(99) 84x+53y=11275
70x+y=6790

(100) 51x-97y=297
19x-y=1520本回答被网友采纳
第2个回答  2016-07-31
1.2x+9y=81
3x+y=34
2.9x+4y=35
8x+3y=30
3.7x+2y=52
7x+4y=62
4.4x+6y=54
9x+2y=87
5.2x+y=7
2x+5y=19
6.x+2y=21
3x+5y=56
7.5x+7y=52
5x+2y=22
8.5x+5y=65
7x+7y=203
9.8x+4y=56
x+4y=21
10.5x+7y=41
5x+8y=44
11.7x+5y=54
3x+4y=38
12.x+8y=15
4x+y=29
13.3x+6y=24
9x+5y=46
14.9x+2y=62
4x+3y=36
15.9x+4y=46
7x+4y=42
16.9x+7y=135
4x+y=41
17.3x+8y=51
x+6y=27
18.9x+3y=99
4x+7y=95
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
21.8x+2y=28
7x+8y=62
22.x+6y=14
3x+3y=27
23.7x+4y=67
2x+8y=26
24.5x+4y=52
7x+6y=74
25.7x+y=9
4x+6y=16
26.6x+6y=48
6x+3y=42
27.8x+2y=16
7x+y=11
28.4x+9y=77
8x+6y=94
29.6x+8y=68
7x+6y=66
30.2x+2y=22
7x+2y=47
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
(4) 76x-66y=4082

30x-y=2940
(5) 67x+54y=8546

71x-y=5680
(6) 42x-95y=-1410

21x-y=1575
(7) 47x-40y=853

34x-y=2006
(8) 19x-32y=-1786

75x+y=4950
(9) 97x+24y=7202

58x-y=2900
(10) 42x+85y=6362

63x-y=1638
(11) 85x-92y=-2518

27x-y=486
(12) 79x+40y=2419

56x-y=1176
(13) 80x-87y=2156

22x-y=880
(14) 32x+62y=5134

57x+y=2850
(15) 83x-49y=82

59x+y=2183
(16) 91x+70y=5845

95x-y=4275
(17) 29x+44y=5281

88x-y=3608
(18) 25x-95y=-4355

40x-y=2000
(19) 54x+68y=3284

78x+y=1404
(20) 70x+13y=3520

52x+y=2132
(21) 48x-54y=-3186

24x+y=1080
(22) 36x+77y=7619

47x-y=799
(23) 13x-42y=-2717

31x-y=1333
(24) 28x+28y=3332

52x-y=4628
(25) 62x-98y=-2564

46x-y=2024
(26) 79x-76y=-4388

26x-y=832
(27) 63x-40y=-821

42x-y=546
(28) 69x-96y=-1209

42x+y=3822

(29) 85x+67y=7338
11x+y=308
(30) 78x+74y=12928

14x+y=1218

(31) 39x+42y=5331
59x-y=5841

(32) 29x+18y=1916
58x+y=2320

(33) 40x+31y=6043
45x-y=3555

(34) 47x+50y=8598
45x+y=3780

(35) 45x-30y=-1455
29x-y=725

(36) 11x-43y=-1361
47x+y=799

(37) 33x+59y=3254
94x+y=1034

(38) 89x-74y=-2735
68x+y=1020

(39) 94x+71y=7517
78x+y=3822

(40) 28x-62y=-4934
46x+y=552

(41) 75x+43y=8472
17x-y=1394

(42) 41x-38y=-1180
29x+y=1450

(43) 22x-59y=824
63x+y=4725

(44) 95x-56y=-401
90x+y=1530

(45) 93x-52y=-852
29x+y=464

(46) 93x+12y=8823
54x+y=4914

(47) 21x-63y=84
20x+y=1880

(48) 48x+93y=9756
38x-y=950

(49) 99x-67y=4011
75x-y=5475

(50) 83x+64y=9291
90x-y=3690

(51) 17x+62y=3216
75x-y=7350

(52) 77x+67y=2739
14x-y=364

(53) 20x-68y=-4596
14x-y=924

(54) 23x+87y=4110
83x-y=5727

(55) 22x-38y=804
86x+y=6708

(56) 20x-45y=-3520
56x+y=728

(57) 46x+37y=7085
61x-y=4636

(58) 17x+61y=4088
71x+y=5609

(59) 51x-61y=-1907
89x-y=2314

(60) 69x-98y=-2404
21x+y=1386

(61) 15x-41y=754
74x-y=6956

(62) 78x-55y=656
89x+y=5518

(63) 29x+21y=1633
31x-y=713

(64) 58x-28y=2724
35x+y=3080

(65) 28x-63y=-2254
88x-y=2024

(66) 43x+50y=7064
85x+y=8330

(67) 58x-77y=1170
38x-y=2280

(68) 92x+83y=11586
43x+y=3010

(69) 99x+82y=6055
52x-y=1716

(70) 15x+26y=1729
94x+y=8554

(71) 64x+32y=3552
56x-y=2296

(72) 94x+66y=10524
84x-y=7812

(73) 65x-79y=-5815
89x+y=2314

(74) 96x+54y=6216
63x-y=1953

(75) 60x-44y=-352
33x-y=1452

(76) 79x-45y=510
14x-y=840

(77) 29x-35y=-218
59x-y=4897

(78) 33x-24y=1905
30x+y=2670

(79) 61x+94y=11800
93x+y=5952

(80) 61x+90y=5001
48x+y=2448

(81) 93x-19y=2
86x-y=1548

(82) 19x-96y=-5910
30x-y=2340

(83) 80x+74y=8088
96x-y=8640

(84) 53x-94y=1946
45x+y=2610

(85) 93x+12y=9117
28x-y=2492

(86) 66x-71y=-1673
99x-y=7821

(87) 43x-52y=-1742
76x+y=1976

(88) 70x+35y=8295
40x+y=2920

(89) 43x+82y=4757
11x+y=231

(90) 12x-19y=236
95x-y=7885

(91) 51x+99y=8031
71x-y=2911

(92) 37x+74y=4403
69x-y=6003

(93) 46x+34y=4820
71x-y=5183

(94) 47x+98y=5861
55x-y=4565

(95) 30x-17y=239
28x+y=1064

(96) 55x-12y=4112
79x-y=7268

(97) 27x-24y=-450
67x-y=3886

(98) 97x+23y=8119
14x+y=966

(99) 84x+53y=11275
70x+y=6790

(100) 51x-97y=297
19x-y=1520