八年级数学下册计算天天练 123Word格式文档下载.docx
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8
三、解下列方程组。
7a=8b-27x+3y=2
{{
5a=2b+79x=2y+4
9x+3y=1389m-7b=29
7y-6x=138-6m-4b=18
16
(3)22;
(4)10-2
(2)-5;
(3)0.064;
(4)1027
6a=6b-49x+y=15
8a=b+173x=2y+15
5x+7y=604m-9b=4
2y-6x=60-6m+8b=30
25
(2)0.64;
(3)14;
(2)-7;
(3)0.027;
(4)1018
27
8a=3b-119x-y=11
9a=2b+156x=5y+6
7x-6y=1652m-7b=3
7y-7x=165-5m+4b=8
64
(2)0.04;
(3)2;
(4)10-10
(2)-4;
(3)0.512;
(4)1024
2a=5b-19x-5y=6
a=2b-135x=3y+11
8x-6y=1506m-b=16
9y+x=150-8m+4b=12
49
(2)0.36;
(3)30;
(4)10-4
196
512
(4)1021
2a=8b-29x+7y=2
4a=9b-16x=9y+9
3x+3y=779m+2b=6
8y+4x=77-8m-b=16
(4)10-18
169
216
8a=9b-54x+4y=12
5a=4b+34x=5y+11
8x-y=60m-8b=2
9y+3x=60-2m+3b=16
81
(2)0.16;
(3)4;
(4)10-6
361
(2)-9;
(3)0.216;
(4)1030
3a=2b+115x-9y=11
5a=3b+52x=y+9
3x-6y=120m+6b=20
3y+9x=120-3m+6b=2
(2)0.01;
(3)13;
6a=8b-116x-5y=2
5a=3b+11x=y+8
4x-7y=147m-5b=15
7y-8x=14-6m+7b=29
144
(2)-1;
5a=8b-169x-3y=3
6a=9b+64x=3y-20
2x+6y=144m+4b=9
8y-2x=14-2m+b=3
(3)7;
(4)10-20
400
(3)0.125;
8a=8b+54x-y=7
8a=5b+54x=9y+13
9x+5y=1425m-2b=7
7y-2x=142-3m+5b=28
121
729
2a=b+62x-7y=10
4a=4b+182x=5y-17
2x+4y=-54m+5b=0
y-4x=-5-8m-5b=29
(4)10-16
(2)-8;
(4)106
a=7b-18x+8y=5
2a=5b-162x=6y-5
8x+7y=1539m-b=27
2y-5x=153-4m-9b=29
(3)26;
6a=4b-11x+8y=18
3a=4b+146x=y+1
6x-7y=287m-6b=18
9y+7x=28-7m+7b=25
(2)0.49;
(3)21;
(2)-3;
4a=b+209x-4y=12
3a=5b-83x=8y+14
8x+y=926m-9b=16
3y-4x=92-3m+8b=13
(3)8;
(2)-6;
a=7b+124x-6y=15
7a=2b-138x=8y+1
6x-9y=1703m-5b=21
9y+6x=170-10m-6b=29
(3)16;
289
343
6a=9b+53x+2y=12
2a=5b-59x=y+1
3x-6y=1567m-7b=19
5y+9x=156-3m-2b=2
(3)29;
324
2a=7b+136x+7y=19
a=2b-203x=7y+2
5x-9y=564m-9b=13
9y-x=56-1m+2b=21
(3)23;
(4)103
2a=9b-1x+5y=6
9a=5b+143x=y-10
3x-6y=94m-2b=17
3y+8x=9-3m-9b=15
(3)19;
6a=9b+79x-9y=12
8a=9b-46x=5y+4
9x+7y=61m+6b=21
y-6x=61-5m-7b=28