初二数学下册计算题专项练习 8Word文件下载.docx
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216
(1)-——;
(2)-9;
(3)0.729;
(4)106
64
三、解下列方程组。
4a=8b+196x+9y=8
{{
9a=2b-156x=y+2
8x-3y=557m+b=16
6y+7x=55-4m+8b=28
49
(2)0.49;
(3)3;
(4)10-8
256
729
(2)-3;
(3)0.064;
(4)1027
8
2a=7b+38x+6y=1
4a=2b+24x=4y+16
7x-2y=1819m-6b=8
3y-9x=181-3m-4b=4
81
(2)0.64;
(3)25;
(4)10-6
(2)-4;
(3)0.343;
(4)1012
6a=2b+72x+9y=17
3a=3b+187x=7y+8
3x-2y=1192m+b=0
9y-7x=119-8m+8b=16
(2)0.09;
(3)5;
(4)10-4
400
125
(3)0.027;
(4)109
3a=3b-52x+8y=11
3a=8b+154x=8y-11
5x-3y=56m+3b=3
7y-8x=5-9m-b=22
(2)0.01;
(3)29;
(4)10-2
196
(2)-6;
(4)1024
27
9a=6b+18x-6y=7
9a=4b+144x=7y-8
9x-6y=935m+9b=26
5y+9x=93-4m-4b=14
(3)10;
169
343
(2)-7;
(3)0.001;
(4)1030
3a=5b+4x-7y=12
5a=6b-53x=9y+8
5x-9y=1357m-b=6
6y-6x=135-7m-4b=17
(2)0.36;
(3)15;
144
(3)0.512;
8a=9b-116x+3y=11
2a=6b-20x=7y+2
5x-4y=893m-8b=13
6y+4x=89-9m-7b=11
(3)22;
361
3a=7b-109x-2y=5
8a=6b-208x=5y+13
6x-5y=1954m+6b=14
7y+7x=195-10m+6b=5
25
(2)0.25;
(3)26;
121
(2)-1;
5a=8b+112x-y=20
2a=4b-134x=8y-10
6x+3y=1422m-2b=16
8y+4x=142-6m+5b=15