2 |
xy |
2?2axy |
xy?2axy |
4axy |
2ax2y2 |
即括號(hào)內(nèi)應(yīng)是4axy.
(2)
x3?xy2 |
(x?y)2 |
x(x+y)(x?y)÷(x?y) |
(x?y)2÷(x?y) |
=
x(x+y) |
x?y |
即括號(hào)內(nèi)應(yīng)是x+y.
2 |
xy |
( ) |
2ax2y2 |
x3?xy2 |
(x?y)2 |
x( ) |
x?y |
2 |
xy |
2?2axy |
xy?2axy |
4axy |
2ax2y2 |
x3?xy2 |
(x?y)2 |
x(x+y)(x?y)÷(x?y) |
(x?y)2÷(x?y) |
x(x+y) |
x?y |