答:
原式
=49-1+2x-x^2
=49-(1-2x+x^2)
=49-(1-x)^2
=(7+1-x)(7-1+x)
=(8-x)(6+x)
阅读下面解题过程:
阅读下面解题过程:
36-a^2+2ab-b^2
=36-(a^2-2ab+b^2)
=6^2-(a-b)^2
={6-(a-b)}{6+(a-b)}
=(6-a+b)(6+a-b)
体会上述过程,请将多项式48+2x-x^2因式分解
36-a^2+2ab-b^2
=36-(a^2-2ab+b^2)
=6^2-(a-b)^2
={6-(a-b)}{6+(a-b)}
=(6-a+b)(6+a-b)
体会上述过程,请将多项式48+2x-x^2因式分解
数学人气:127 ℃时间:2020-03-27 16:37:49
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