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因式分解2(x平方+1)-5x
人气:284 ℃ 时间:2020-03-20 23:23:17
解答
2( x” + 1 ) - 5x
= 2x” + 2 - 5x
= 2x" - 4x - x + 2
= 2x( x - 2 ) - ( x - 2 )
= ( x - 2 )( 2x - 1 )
或者
= 2x” - x - 4x + 2
= x( 2x - 1 ) - 2( 2x - 1 )
= ( x - 2 )( 2x - 1 )
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