八年级数学下册计算天天练 1Word文档格式.docx
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三、解下列方程组。
3a=2b-122x-6y=7
{{
4a=9b-1x=8y+19
5x+3y=71m+3b=10
7y+9x=71-3m+6b=23
25
(2)0.64;
(3)13;
196
125
(2)-6;
(3)0.001;
(4)106
64
3a=2b+99x+3y=16
a=8b+147x=2y+5
x+8y=153m+8b=6
3y+2x=15-2m+8b=25
81
(2)0.01;
(3)24;
(4)10-8
400
512
(3)0.343;
(4)1030
9a=6b+134x-2y=19
3a=4b-209x=7y+4
8x+3y=32m+7b=8
4y-x=32-1m-8b=26
(2)0.49;
(2)-3;
(3)0.216;
27
9a=6b-178x-7y=20
4a=7b+196x=2y+20
4x-6y=1077m-9b=8
7y-7x=107-9m+8b=9
49
(2)0.81;
(3)14;
(4)10-4
(2)-8;
(3)0.512;
3a=7b-66x-8y=2
7a=2b+198x=4y+19
x-y=-28m+5b=13
5y-7x=-2-5m+6b=12
(2)0.25;
(3)25;
169
(4)1021
7a=5b+106x+8y=2
8a=3b+109x=8y-12
9x+6y=255m-2b=19
2y-7x=25-9m+5b=27
(3)19;
(4)10-10
(2)-1;
(3)0.125;
8a=3b+104x-8y=6
6a=8b-195x=y-16
x+5y=407m-8b=29
4y-x=40-4m-7b=23
(3)8;
289
(2)-2;
(4)1015
3a=7b-175x+4y=2
5a=4b-18x=5y+1
7x-4y=209m+5b=29
5y+x=20-6m+7b=1
36
(3)17;
(4)10-14
343
(2)-4;
2a=4b+33x-7y=19
3a=4b+17x=5y+9
4x-5y=-55m-5b=22
3y+8x=-5-6m+8b=3
(3)2;
144
(3)0.008;
(4)1012
4a=3b-152x+5y=17
5a=5b+155x=6y-2
x-3y=475m-2b=19
5y-8x=47-9m-7b=21
(4)10-18
(2)-5;
(3)0.729;
8a=7b+2x+4y=1
3a=5b-34x=7y+1
x-3y=1693m-3b=0
9y+4x=169-3m-9b=7
(2)0.04;
(3)30;
324
5a=7b-154x-3y=15
a=2b-29x=9y+11
7x+2y=-58m-3b=23
3y+9x=-5-2m+3b=27
(3)3;
(2)-9;
(4)1018
3a=6b+174x-8y=18
8a=3b+54x=4y-12
7x-3y=172m-9b=0
6y+6x=17-7m-8b=22
(3)27;
(4)10-16
121
(3)0.064;
(4)109
4a=8b-199x+7y=10
7a=b+156x=7y-1
6x-5y=699m+9b=4
6y+8x=69-8m+9b=9
(3)7;
5a=8b-97x+6y=8
9a=4b+166x=5y-10
7x+6y=97m+7b=12
7y+x=97-10m+3b=14
(3)21;
729
(4)1024
5a=b-177x-5y=16
2a=5b+73x=7y-8
7x+5y=1137m+5b=24
3y+7x=113-3m-5b=22
(2)0.16;
(2)-7;
3a=6b-44x+3y=13
5a=5b-27x=9y+9
8x+7y=1652m+9b=6
y+8x=165-1m+2b=18
(3)4;
361
3a=5b+207x+4y=6
4a=6b+5x=8y+8
9x-4y=45m+3b=23
y-2x=4-6m-2b=2
9a=9b-147x+5y=19
a=5b-14x=8y-10
8x+7y=1657m-5b=15
4y-2x=165-8m-6b=25
(4)10-6
8a=6b-20x+8y=2
2a=2b-4x=9y+4
7x+6y=37m-5b=26
7y+5x=37-10m+b=9