题目内容
请你先化简分式
÷(
-
),再将x=3-
,y=
代入求值.
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
3 |
3 |
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
=
(x-y)2 |
x(x-y) |
x2-y2 |
xy |
=
x-y |
x |
xy |
(x+y)(x-y) |
=
y |
x+y |
当x=3-
3 |
3 |
原式=
| ||||
3-
|
| ||
3 |
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题目内容
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
3 |
3 |
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
(x-y)2 |
x(x-y) |
x2-y2 |
xy |
x-y |
x |
xy |
(x+y)(x-y) |
y |
x+y |
3 |
3 |
| ||||
3-
|
| ||
3 |