通分X/4-2X,1/X^2-4
怎样通分啊,它的最简公分母是什么?
人气：255 ℃ 时间：2020-05-08 08:20:36
解答
4-2x=-2(x-2)
x^2-4=(x+2)(x-2)
∴最简公分母是2(x+2)(x-2)
x/(4-2x)=-x/2(x-2)=-x(x+2)/2(x+2)(x-2)
1/(x^2-4)=2/2(x+2)(x-2)
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