题目内容
已知(4a+1)2+|2b-a-
|=0,化简并求出4(3a-5b)-3(5a-7b+1)+(2a+7b-1)的值.
| 3 |
| 4 |
∵(4a+1)2+|2b-a-
|=0,
∴4a+1=0.2b-a-
=0,
解得a=-
,b=
,
∴4(3a-5b)-3(5a-7b+1)+(2a+7b-1),
=-a+8b-4,
=-(-
)+8×
-4
=-1
.
| 3 |
| 4 |
∴4a+1=0.2b-a-
| 3 |
| 4 |
解得a=-
| 1 |
| 4 |
| 1 |
| 4 |
∴4(3a-5b)-3(5a-7b+1)+(2a+7b-1),
=-a+8b-4,
=-(-
| 1 |
| 4 |
| 1 |
| 4 |
=-1
| 3 |
| 4 |
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