八年级数学下册计算天天练 84Word文档格式.docx
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(2)-3;
(3)0.027;
(4)1030
8
三、解下列方程组。
3a=8b+12x-y=7
{{
5a=9b-109x=5y-12
x-y=999m-8b=11
2y+5x=99-2m+7b=21
16
(2)0.09;
(3)29;
(4)10-2
289
125
(2)-9;
(3)0.343;
(4)1018
27
4a=8b+43x-5y=3
6a=7b-43x=8y+11
9x+4y=1545m-7b=7
y+9x=154-2m+8b=4
25
(3)5;
(4)10-16
144
216
(3)0.512;
(4)1021
8a=b+32x-2y=11
3a=6b-86x=3y+5
x-5y=1588m+9b=24
5y-x=158-10m+3b=3
81
(2)0.01;
(3)6;
(4)10-18
(2)-5;
(3)0.064;
9a=9b+118x-y=18
9a=2b+42x=6y-8
4x-7y=33m-3b=22
3y+3x=33-1m-7b=21
(2)0.16;
(3)18;
196
(2)-1;
(3)0.001;
2a=b-96x-8y=1
6a=7b-27x=5y+11
6x-2y=1612m+9b=22
8y+2x=161-2m-5b=10
36
(2)0.49;
(3)15;
(4)10-6
361
(2)-6;
4a=8b+204x+y=10
3a=2b-156x=3y-8
x-2y=747m-3b=1
y-9x=74-9m-b=15
(2)0.04;
(3)16;
(4)10-12
(2)-7;
a=8b-72x+9y=6
7a=7b+158x=8y+16
x-8y=03m-6b=20
9y-2x=0-8m+5b=20
(2)0.64;
(3)13;
(4)10-8
(2)-4;
(3)0.125;
(4)1024
9a=2b+104x+9y=20
3a=2b+179x=4y-6
2x+6y=1428m-7b=30
5y-2x=142-4m-b=25
49
(4)10-10
(2)-10;
6a=7b+39x+3y=2
6a=9b-148x=7y-9
9x+2y=1619m-9b=17
5y+9x=161-5m-6b=20
2a=9b-8x-3y=19
8a=9b+112x=4y-5
8x-2y=1974m+6b=6
6y-3x=197-3m+b=7
(3)25;
169
512
2a=4b+146x+8y=15
2a=6b+4x=4y-8
x-6y=84m+b=4
7y-9x=8-7m+5b=8
9a=2b-12x-y=16
7a=9b+98x=y+17
x-7y=1583m+7b=8
3y-4x=158-7m-4b=4
400
(2)-8;
(3)0.216;
(4)1027
9a=6b-202x+7y=13
6a=9b+199x=5y-7
6x+3y=972m-b=3
7y+5x=97-1m+4b=22
(2)0.81;
(3)12;
512