八年级数学下册计算天天练 56Word文件下载.docx
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27
三、解下列方程组。
5a=2b-164x+7y=18
{{
a=6b+159x=5y-18
7x-4y=1416m+4b=15
7y+8x=141-7m-4b=22
81
(2)0.25;
(3)4;
(4)10-16
144
(2)-2;
(3)0.216;
(4)109
64
6a=5b+205x+6y=12
8a=8b-199x=6y+13
5x+2y=1756m-6b=25
y-6x=175-3m-9b=6
36
(2)0.04;
(3)27;
(4)10-14
225
(2)-4;
(3)0.008;
(4)1021
7a=4b-33x-y=2
8a=9b+13x=4y+13
5x+7y=1853m+2b=17
9y-4x=185-9m-b=4
25
(2)0.16;
(3)26;
196
343
8
4a=9b+37x+9y=15
6a=6b-13x=2y-14
5x-8y=302m-2b=18
2y-9x=30-3m+5b=13
16
(2)0.64;
(3)10;
(4)10-20
(3)0.729;
5a=7b-104x-2y=7
6a=b+159x=3y-4
5x+8y=417m+3b=9
2y+3x=41-6m-8b=6
(4)10-6
512
(2)-8;
3a=6b-76x+4y=10
3a=7b+23x=7y-19
3x-3y=1714m+8b=24
3y+7x=171-10m+b=9
(3)13;
256
(2)-5;
(3)0.001;
(4)1024
a=7b+169x-5y=10
9a=2b+17x=7y+8
8x+9y=917m+3b=3
8y+9x=91-7m+8b=12
(2)0.09;
(3)9;
(4)10-8
729
(2)-7;
(3)0.027;
(4)1018
4a=b+36x+5y=11
6a=6b+156x=y-17
x+y=125m+4b=17
6y+8x=125-10m-b=10
121
216
2a=8b+145x-9y=2
7a=7b-155x=5y-12
2x-2y=966m-8b=30
4y+6x=96-2m-8b=14
(2)0.49;
(2)-3;
(4)103
9a=b-164x-y=8
3a=7b+18x=y+12
6x+7y=1776m+9b=9
9y-6x=177-6m+2b=14
(2)0.36;
(3)30;
(2)-10;
7a=6b+93x+3y=8
3a=5b-146x=y+7
5x-y=384m+9b=9
3y-x=38-1m+4b=3
(3)19;
(4)10-10
7a=3b-45x-5y=6
2a=3b-57x=4y-17
2x-2y=1945m+9b=6
2y+7x=194-4m+8b=22
(3)1;
324
9a=3b-23x+4y=2
2a=b+193x=6y+11
5x-8y=34m+4b=6
4y-3x=34-10m+9b=28
(3)25;
289
(4)106
2a=8b-17x-8y=15
a=8b-23x=6y-17
6x-7y=1022m+9b=2
8y+x=102-5m-5b=21
7a=4b-149x-6y=6
5a=5b-85x=5y+6
6x+y=1157m-2b=25
7y-7x=115-9m+7b=17
2a=6b+76x+6y=16
4a=8b+102x=7y-5
8x-8y=1658m-3b=23
2y-9x=165-5m-8b=24
(3)23;
(2)-9;
(3)0.343;
8a=9b+204x-2y=5
4a=8b+97x=7y-17
8x-8y=119m-5b=18
4y-x=11-8m-2b=10
(3)22;
361
2a=6b+72x-6y=1
9a=8b+97x=9y-12
9x-8y=614m+8b=23
4y+5x=61-5m-2b=12
(3)17;
2a=2b+198x+5y=4
2a=5b-67x=3y-10
x-8y=1855m-8b=26
6y+5x=185-1m+5b=25