八年级数学下册计算天天练 78文档格式.docx
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三、解下列方程组。
2a=8b-62x-5y=20
{{
6a=b+204x=5y+10
7x-4y=66m+6b=28
7y-3x=66-8m+5b=12
16
(2)0.25;
(3)12;
(4)10-10
289
343
(3)0.001;
(4)1030
4a=b+26x-6y=17
a=6b+147x=8y-17
5x-3y=1556m-b=19
6y+9x=155-3m-5b=9
36
(2)0.01;
(3)20;
(4)10-2
729
(3)0.216;
(4)1021
8a=2b+156x+7y=19
7a=5b-175x=3y-20
x-7y=802m+8b=19
8y+8x=80-9m+4b=19
81
100
125
(2)-9;
(3)0.027;
(4)109
7a=5b-4x+8y=4
8a=7b-144x=9y+12
4x-9y=1208m+8b=9
5y-3x=120-10m-3b=4
(2)0.16;
(3)7;
(4)10-4
216
(2)-6;
(4)1015
8a=6b-15x+2y=6
9a=b+143x=7y-4
4x+2y=432m-2b=0
6y-x=43-7m-b=22
(2)0.49;
(3)16;
(4)10-6
121
(3)0.008;
8a=3b+34x+5y=20
a=6b+208x=8y-5
6x+7y=-59m+6b=13
5y+5x=-5-5m-8b=5
25
(2)0.04;
(3)9;
(4)10-20
324
(2)-10;
(4)1024
8a=6b-175x+6y=16
4a=7b+14x=3y+9
7x-3y=473m+3b=9
7y-7x=47-7m-4b=3
(3)1;
400
(2)-3;
(3)0.512;
8a=8b-106x+2y=3
6a=2b-124x=5y-2
9x+7y=479m+8b=24
y+2x=47-9m-2b=2
49
(3)10;
(4)10-16
196
(4)1018
27
5a=7b+122x+9y=18
8a=5b-52x=8y+13
5x-9y=1106m-5b=27
8y-9x=110-1m+5b=18
(2)0.09;
(4)103
5a=2b+137x-8y=5
3a=8b+198x=5y-17
3x-y=-32m+9b=5
6y+7x=-3-10m-5b=4
(2)0.64;
(3)28;
(4)10-18
(2)-5;
4a=6b+92x-3y=5
7a=5b-197x=8y-2
9x-6y=1339m+b=6
9y-3x=133-3m-5b=28
(4)1027
a=4b-137x-6y=17
3a=2b+34x=9y-14
8x-3y=-37m+9b=10
y+3x=-3-8m+9b=1
(3)6;
361
(2)-2;
3a=6b+46x+3y=17
4a=5b-105x=5y-17
9x-4y=1163m+b=3
8y-6x=116-3m-2b=17
169
7a=6b-196x-6y=6
2a=6b-129x=2y+2
5x+y=12m-2b=1
6y-6x=1-6m+6b=21
(3)0.729;
4a=b+157x-4y=4
6a=9b-146x=6y-11
8x-3y=462m+7b=14
2y+5x=46-1m-4b=17
(3)18;
7a=9b+169x-4y=6
a=4b-37x=3y+4
3x-8y=619m+6b=22
5y-2x=61-2m+8b=0
(4)10-14
a=2b-173x+8y=1
5a=4b-97x=6y+18
8x-7y=644m+5b=11
2y+9x=64-6m+2b=16
(2)-7;
8a=2b+142x-7y=6
6a=6b-206x=9y-17
8x-9y=149m-7b=5
9y+6x=14-10m-4b=3
(3)0.125;
7a=2b+136x+5y=4
2a=3b+202x=8y-19
7x-3y=706m+5b=27
7y+9x=70-9m+7b=6
(3)13;
7a=b-54x-4y=9
3a=2b-19x=5y-13
5x-9y=1454m+6b=20
8y-x=145-6m-4b=16