4(x+y)^2-9(x-y)^2
要过程,越详细越好
參考答案:解:4(x+y)^2-9(x-y)^2
=[2(x+y)]^2-[3(x-y)]^2
=[2(x+y)+3(x-y)][2(x+y)-3(x-y)]
=(5x-y)(5y-x)
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4(x+y)^2-9(x-y)^2
要过程,越详细越好
參考答案:解:4(x+y)^2-9(x-y)^2
=[2(x+y)]^2-[3(x-y)]^2
=[2(x+y)+3(x-y)][2(x+y)-3(x-y)]
=(5x-y)(5y-x)