难的26题,因式分解,求过程
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发布时间:2024-07-13 04:10
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时间:2024-08-16 13:36
8x³+27y³+18xy-1
=8x³+36x²y+54xy²+27y³-36x²y-54xy²+18xy-1
=(2x+3y)³-36x²y-54xy²+18xy-1
=(2x+3y-1)(4x²+12xy+9y²+2x+3y+1)-18xy(2x+3y-1)
=(2x+3y-1)(4x²+12xy+9y²+2x+3y+1-18xy)
=(2x+3y-1)(4x²-6xy+9y²+2x+3y+1)