题目内容
已知x-2y=0,求
•(x-y)的值.
| 2x+y |
| x2-2xy+y2 |
原式=
•(x-y)
=
,
∵x-2y=0,
∴x=2y,
∴原式=
=5.
| 2x+y |
| (x-y)2 |
=
| 2x+y |
| x-y |
∵x-2y=0,
∴x=2y,
∴原式=
| 4y+y |
| 2y-y |
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题目内容
| 2x+y |
| x2-2xy+y2 |
| 2x+y |
| (x-y)2 |
| 2x+y |
| x-y |
| 4y+y |
| 2y-y |