因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/02 20:27:37
x){:{=O;^,_~,#S
JM5eCsk]K
]t %J@t
Bz6IET4MΆڮí,m
5BP.DQEEQ&D(fRR ]dC :z#8#<;P
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
25(x+y)²-9(x-y)²
=[5(x+y)-3(x-y)][5(x+y)+3(x-y)]
=(2x+8y)(8x+2y)
=4(x+4y)(4x+y)
(x+y)²-4(x+y-1).
=(x+y)²-4(x+y)+4
=(x+y-2)^2