八年级数学下册计算天天练 156文档格式.docx
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三、解下列方程组。
4a=6b-26x-9y=17
{{
8a=8b-57x=4y+16
9x+y=1919m+8b=6
2y-8x=191-6m+3b=17
(2)0.04;
(3)14;
(4)10-6
121
343
(2)-2;
(3)0.001;
(4)1012
27
2a=b-134x+6y=7
4a=4b-178x=2y+7
8x+4y=329m-8b=5
7y+6x=32-10m+6b=14
25
(3)16;
(4)10-4
324
(3)0.512;
6a=b+127x-2y=8
8a=4b-134x=5y-14
7x-3y=-34m+8b=2
8y+6x=-3-1m+2b=30
(3)30;
(4)10-2
196
(2)-8;
(4)103
8
3a=9b+3x+4y=8
7a=9b+207x=7y-14
2x+3y=1005m+b=23
y+7x=100-2m+b=11
16
(2)0.36;
(3)4;
729
(2)-6;
(3)0.343;
(4)1018
3a=2b+99x-8y=12
a=b-162x=3y+15
3x-y=1289m-b=28
3y+2x=128-7m+2b=11
(2)0.81;
(3)3;
(4)10-16
225
216
(3)0.125;
(4)1021
6a=6b+109x+3y=16
a=6b-89x=3y-14
3x-7y=1692m+8b=16
3y+2x=169-10m+7b=1
(2)0.16;
(3)20;
289
(2)-3;
2a=5b-17x-y=8
3a=b+129x=4y-3
2x-8y=148m-7b=18
6y+9x=148-9m+2b=10
(2)0.25;
(3)2;
144
125
(2)-4;
(3)0.064;
(4)106
7a=9b+92x+y=9
6a=b-169x=6y-18
2x-4y=1207m-3b=27
7y+2x=120-3m-5b=2
49
6a=8b+102x-3y=2
2a=5b-44x=9y-3
x-6y=104m-3b=7
y+6x=104-9m+7b=28
(3)25;
100
(4)1015
5a=3b+192x+9y=9
4a=b-139x=7y-6
3x+2y=422m+b=19
6y+4x=42-9m+2b=14
(2)-9;
(3)0.008;
(4)1030
2a=5b+18x-6y=4
7a=3b-82x=2y+1
7x+y=378m+3b=2
9y-2x=37-5m-6b=30
81
(2)0.64;
(3)12;
(2)-7;
(4)1027
4a=9b+184x-2y=17
2a=2b-204x=9y-6
8x+5y=-39m-7b=2
y+5x=-3-8m+8b=13
(2)0.09;
(3)8;
(4)10-12
256
(2)-5;
4a=5b-16x-6y=8
a=b+8x=7y+11
x-2y=1329m+5b=7
y+x=132-4m-3b=28
(3)29;
(4)10-20
361
4a=6b-18x+8y=7
8a=b-68x=5y+3
6x-2y=573m+b=21
5y+5x=57-2m+4b=18
(3)27;
a=3b-29x-5y=16
6a=3b+178x=7y-5
x-3y=1572m+5b=5
9y-3x=157-1m+6b=21
(3)18;
5a=2b+1x+8y=16
5a=7b+36x=8y-1
3x+y=297m+3b=11
5y-2x=29-10m+2b=10
(3)0.027;
4a=7b+187x-4y=9
6a=b-45x=9y-4
2x+7y=1816m+5b=11
3y-9x=181-8m-7b=6
7a=9b+58x+9y=11
5a=5b-186x=5y+2
9x+6y=185m+9b=20
5y+4x=18-4m+2b=4
(3)9;
(2)-1;
7a=3b-103x-7y=5
2a=8b-77x=5y+16
7x+3y=1547m-4b=16
y+2x=154-9m-4b=30