因式分解x²y³-4x²y

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因式分解x²y³-4x²y因式分解x²y³-4x²y因式分解x²y³-4x²yx²y³-4

因式分解x²y³-4x²y
因式分解x²y³-4x²y

因式分解x²y³-4x²y
x²y³-4x²y
=x²y(y²-4)
=x²y(y+2)(y-2)