八年级数学下册计算天天练 127Word文件下载.docx
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三、解下列方程组。
3a=7b+16x-4y=18
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8a=2b+19x=3y-12
9x-3y=1489m+6b=30
6y-7x=148-3m-3b=0
(3)8;
(4)10-18
361
(2)-8;
(3)0.216;
(4)1030
8a=8b+12x-y=20
6a=3b+145x=y+17
3x-6y=1737m+2b=26
y+2x=173-9m-4b=16
64
(2)0.16;
(3)18;
(4)10-12
324
512
(2)-10;
(3)0.001;
(4)1027
27
2a=8b+46x+y=17
a=6b+82x=5y+9
x+7y=669m-4b=20
6y-3x=66-7m+6b=23
16
(2)0.25;
(3)26;
216
(2)-2;
(3)0.027;
(4)1024
4a=8b-36x-2y=12
2a=9b-78x=4y-12
5x-6y=447m+2b=16
8y-4x=44-8m-2b=25
(2)0.09;
(3)4;
100
(2)-6;
3a=9b-9x-6y=2
a=4b-36x=6y-12
8x-3y=1758m+8b=30
8y-5x=175-7m-2b=30
25
(2)0.01;
(3)30;
(4)10-2
256
(3)0.125;
2a=6b-176x+2y=19
6a=5b-45x=7y-17
8x+7y=917m-7b=24
4y-9x=91-4m-5b=28
196
(2)-7;
(3)0.343;
(4)1012
2a=8b+174x-8y=5
3a=5b-87x=8y+7
6x-7y=1098m-2b=9
5y-8x=109-6m-9b=17
81
(3)21;
343
8a=2b+155x-8y=1
2a=b+113x=5y-15
6x+2y=1888m-8b=29
9y+9x=188-3m-5b=30
(2)0.04;
(3)13;
289
(2)-9;
(4)106
3a=6b+19x+5y=11
9a=9b+157x=4y-1
9x+9y=763m-3b=26
2y+x=76-1m-9b=17
(2)0.64;
(4)10-16
5a=3b+19x-7y=16
8a=3b-23x=2y+20
x-6y=1564m-6b=7
6y-5x=156-2m-b=5
(3)19;
(2)-5;
(3)0.008;
4a=7b+10x+9y=19
3a=4b-33x=6y+1
8x-5y=1254m+5b=21
9y-7x=125-3m-5b=2
(3)14;
(4)10-4
225
(2)-1;
8a=5b-18x-9y=17
9a=5b-122x=9y+4
4x-y=469m+4b=10
6y-5x=46-5m-b=8
2a=3b+28x-4y=20
4a=5b+59x=7y-6
x+y=1955m-6b=17
5y-x=195-5m+3b=12
(3)5;
(4)10-10
144
(3)0.729;
3a=7b+57x+3y=16
2a=5b+68x=9y-11
6x-7y=68m+7b=18
9y-2x=6-8m+b=14
(3)24;
4a=3b-156x-9y=7
9a=5b-146x=6y+12
x-y=1783m+5b=8
2y-3x=178-9m-3b=19
(3)25;
729
(2)-4;
8a=4b+10x-2y=2
7a=4b-118x=5y+14
8x+5y=875m-3b=16
9y-4x=87-4m+3b=9
(4)10-6
3a=7b-45x+2y=4
4a=5b-97x=2y-9
7x+7y=724m-7b=11
6y+9x=72-4m-2b=8
49
9a=2b-108x-3y=10
8a=4b-178x=7y+12
7x+3y=1522m+5b=21
3y-5x=152-9m-9b=22
121
(3)0.064;
(4)1021
5a=b-19x-7y=7
3a=5b-193x=8y+15
x+7y=1153m+7b=15
4y+9x=115-8m+6b=26
(3)17;
4a=7b-73x-6y=18
9a=3b-136x=7y-11
x+4y=1183m-6b=10
8y+2x=118-6m-9b=28