八年级数学下册计算天天练 117Word格式文档下载.docx
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三、解下列方程组。
a=7b+82x+6y=6
{{
6a=3b+97x=6y+20
9x+6y=22m+9b=15
6y-6x=22-5m-3b=12
(2)0.81;
(3)17;
(4)10-18
144
216
(2)-6;
(3)0.001;
(4)1018
a=7b-65x-4y=16
2a=3b-177x=6y-15
5x+7y=735m+5b=8
4y+6x=73-4m+7b=14
25
(2)0.04;
(3)28;
(2)-3;
(3)0.064;
(4)1024
64
3a=7b-16x+6y=2
8a=9b+118x=9y-3
x+4y=1295m-4b=27
9y-7x=129-3m-6b=7
(4)10-6
225
125
(2)-9;
(3)0.729;
(4)1015
2a=5b-3x-9y=6
3a=4b-47x=7y+3
4x+3y=1936m+3b=12
9y-x=193-10m+6b=2
16
(3)1;
(4)10-4
256
729
(2)-10;
(3)0.512;
(4)103
a=9b-19x-6y=5
8a=9b-15x=9y-16
x+2y=0m-6b=9
y+4x=0-2m-6b=5
49
(3)13;
(4)10-10
(3)0.125;
7a=5b+203x+y=11
3a=2b-113x=5y-7
x-7y=171m+3b=4
4y+2x=171-1m+4b=12
(3)7;
400
27
4a=8b+1x-y=17
6a=5b-207x=2y+15
5x-4y=-62m-2b=25
6y+7x=-6-7m+b=0
81
(2)0.64;
(3)10;
(4)10-8
(2)-4;
(3)0.027;
9a=4b-62x+8y=15
9a=3b-65x=8y+6
4x+7y=55m-7b=6
5y-x=5-6m-2b=12
(2)0.01;
(3)24;
(2)-8;
(4)1030
2a=5b-16x+2y=10
2a=5b-107x=y-1
8x-7y=676m+7b=28
y+x=67-10m+3b=17
(2)0.36;
(3)26;
(4)10-14
121
512
(4)1012
5a=2b-63x+y=4
5a=6b+10x=8y-16
x-2y=1868m+9b=18
y+7x=186-3m-b=8
(2)0.49;
324
(3)0.343;
8a=7b-168x-2y=14
7a=5b-33x=9y+15
x+3y=1997m-b=6
4y+7x=199-6m+8b=13
(2)0.25;
(3)12;
(4)10-16
289
(4)106
6a=8b-208x+9y=2
7a=4b+147x=2y+9
7x-2y=926m-2b=26
6y+7x=92-2m+4b=19
(3)27;
(4)10-2
2a=3b-208x-y=7
9a=2b-152x=4y+5
3x+2y=402m-6b=16
4y-7x=40-5m-7b=28
(2)-1;
6a=6b-17x+3y=17
3a=7b-68x=8y-9
x-2y=1757m-5b=29
5y+6x=175-7m+5b=20
(3)21;
196
(2)-5;
4a=7b-12x-4y=7
4a=5b-67x=2y-7
x-3y=1525m-8b=9
7y+5x=152-6m+2b=9
100
4a=8b-158x-6y=1
3a=8b-15x=9y+3
9x+3y=1639m+9b=4
9y+4x=163-2m-9b=8
(3)16;
7a=9b-175x+9y=20
2a=9b+195x=8y+13
5x-8y=347m-8b=16
7y+4x=34-4m-5b=14
3a=6b-187x+4y=2
9a=b+92x=8y-13
7x+5y=1826m-5b=13
9y+x=182-1m-6b=12
(3)2;
(3)0.216;
2a=7b+207x-7y=18
5a=3b+193x=4y-9
3x-y=368m-2b=14
2y+3x=36-3m-b=14