4(x-y)^2-9(x+y)^2因式分解,

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4(x-y)^2-9(x+y)^2因式分解,4(x-y)^2-9(x+y)^2因式分解,4(x-y)^2-9(x+y)^2因式分解,4(x-y)^2-9(x+y)^2=[2(x-y)]^2-[3(x+

4(x-y)^2-9(x+y)^2因式分解,
4(x-y)^2-9(x+y)^2因式分解,

4(x-y)^2-9(x+y)^2因式分解,
4(x-y)^2-9(x+y)^2
=[2(x-y)]^2-[3(x+y)]^2
=(2x-2y)^2-(3x+3y)^2
=(2x-2y+3x+3y)(2x-2y-3x-3y)
=-(5x+y)(x+5y)

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

原式=[2(x-y)]^2-[3(x+y)]^2
=[2x-2y+3x+3y][2x-2y-3x-3y]
= - [5x+y][x+5y]
用平方差公式进行分解,a^2-b^2=(a+b)(a-b)
注意外面的负号别漏