
1个回答
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-x” + x + 56
= -[ x” - x - 56 ]
= -[ x” + 7x - 8x - 56 ]
= -[ x( x + 7 ) - 8( x + 7 ) ]
= -( x + 7 )( x - 8 )
或者
= -[ x” - x - 56 ]
= -[ x” - 8x + 7x - 56 ]
= -[ x( x - 8 ) + 7( x - 8 ) ]
= -( x + 7 )( x - 8 )
= -[ x” - x - 56 ]
= -[ x” + 7x - 8x - 56 ]
= -[ x( x + 7 ) - 8( x + 7 ) ]
= -( x + 7 )( x - 8 )
或者
= -[ x” - x - 56 ]
= -[ x” - 8x + 7x - 56 ]
= -[ x( x - 8 ) + 7( x - 8 ) ]
= -( x + 7 )( x - 8 )
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