(2x-3y)(4x^2+6xy+9y^2)=?
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(2x-3y)(4x^2+6xy+9y^2)=?
立方差公式
=(2x)^3-(3y)^3
=8x^3-27y^3
=(2x)^3-(3y)^3
=8x^3-27y^3
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化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
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