(x-2y)(x方-2xy+4y方)=?
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(x-2y)(x方-2xy+4y方)=?
(x-2y)(x方-2xy+4y方)
=x³-2x²y+4xy²-2x²y+4xy²-8y³
=x³-4x²y+8xy²-8y³
=x³-2x²y+4xy²-2x²y+4xy²-8y³
=x³-4x²y+8xy²-8y³
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(x-2y)(x方-2xy+4y方)=?
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