(x+1)(x+2)(x+3)(x+4)+1因式分解
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( x + 1 )( x + 2 )( x + 3 )( x + 4 ) + 1
= ( x + 4 )( x + 1 )( x + 2 )( x + 3 ) + 1
= ( x" + 4x + x + 4 )( x" + 2x + 3x + 6 ) + 1
= ( x" + 5x + 5 - 1 )( x" + 5x + 5 + 1 ) + 1
= ( x" + 5x + 5 )" - 1" + 1
= ( x" + 5x + 5 )"
= ( x + 4 )( x + 1 )( x + 2 )( x + 3 ) + 1
= ( x" + 4x + x + 4 )( x" + 2x + 3x + 6 ) + 1
= ( x" + 5x + 5 - 1 )( x" + 5x + 5 + 1 ) + 1
= ( x" + 5x + 5 )" - 1" + 1
= ( x" + 5x + 5 )"
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