因式分解:4+12(x+y)+9(x-y)^2=?
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因式分解:4+12(x+y)+9(x-y)^2=?
因式分解:4+12(x+y)+9(x-y)^2=?
因式分解:4+12(x+y)+9(x-y)^2=?
4+12(x+y)+9(x-y)^2=(2+3X-3Y)^2
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