摘要：17．(﹣x6+3x5)+(﹣2x6+x5)+(x+1)(3x6﹣4x5)与下列哪一个式子相同?( ) A． (3x6﹣4x5) B． (3x6﹣4x5) C． ﹣(3x6﹣4x5) D． ﹣(3x6﹣4x5) 解析:原式=(﹣x6+3x5﹣2x6+x5)+(x+1)(3x6﹣4x5) =(﹣3x6+4x5)+(x+1)(3x6﹣4x5) =﹣(3x6﹣4x5)(3x+2﹣x﹣1) =﹣(3x6﹣4x5)． 故选:C

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