25(x+y)²-9(x-y)²

25(x+y)²-9(x-y)²

您好：

25(x+y)²-9(x-y)²
=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]
=(8x+2y)(2x+8y)
=4(4x+y)(x+4y)

不明白,可以追问
如有帮助,记得采纳,谢谢
祝学习进步!

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)