因式分解:25(x+y)²-9(x-y)²;(x+y)²-4(x+y-1).
来源:学生作业学帮网 编辑:学帮网 时间:2024/06/06 08:01:26
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
收录互联网各类作业题目,免费共享学生作业习题
慧海网手机作业共收录了 千万级 学生作业题目
来源:学生作业学帮网 编辑:学帮网 时间:2024/06/06 08:01:26
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