题目内容
化简求值:(
)•(
+x),其中
+|y-1|=0.
| x2y-4y 3 |
| x2+4xy+4y2 |
| 4xy |
| x-2y |
| x+2 |
∵
+|y-1|=0,
∴x=-2,y=1,
则原式=
•
=
•
=xy=-2.
| x+2 |
∴x=-2,y=1,
则原式=
| y(x+2y)(x-2y) |
| (x+2y)2 |
| 4xy+x(x-2y) |
| x-2y |
=
| y(x+2y)(x-2y) |
| (x+2y)2 |
| x(x+2y) |
| x-2y |
=xy=-2.
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