分解因式 急！！！！
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0.25（x+y)²-0.81（x-y)²
=[1/2(x+y)]^2-[9/10(x-y)]^2
=[1/2(x+y)+9/10(x-y)][1/2(x+y)-9/10(x-y)]
=(7/5x-2/5y)(7/5y-2/5x)
=[1/2(x+y)]^2-[9/10(x-y)]^2
=[1/2(x+y)+9/10(x-y)][1/2(x+y)-9/10(x-y)]
=(7/5x-2/5y)(7/5y-2/5x)
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