(x+1)(x-1)-(1-x)的因式分解 5
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( x + 1 )( x - 1 ) - ( 1 - x )
= ( x + 1 )( x - 1 ) + ( x - 1 )
= ( x - 1 )( x + 1 + 1 )
= ( x - 1 )( x + 2 )
= x” + 2x - x - 2
= x” + x - 2
或者
= x” - 1 - 1 + x
= x” + x - 2
= x” - x + 2x - 2
= x( x - 1 ) + 2( x - 1 )
= ( x - 1 )( x + 2 )
= ( x + 1 )( x - 1 ) + ( x - 1 )
= ( x - 1 )( x + 1 + 1 )
= ( x - 1 )( x + 2 )
= x” + 2x - x - 2
= x” + x - 2
或者
= x” - 1 - 1 + x
= x” + x - 2
= x” - x + 2x - 2
= x( x - 1 ) + 2( x - 1 )
= ( x - 1 )( x + 2 )
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