问题标题:
【初高中衔接课程数学自主训练该题如下1/(x+2)+1/(x+3)=1/(x+1)+1/(x+4)】
问题描述:
初高中衔接课程数学自主训练该题如下
1/(x+2)+1/(x+3)=1/(x+1)+1/(x+4)
陆正福回答:
为方便计算,可令t=x+2,则原方程即为:1/t+1/(t+1)=1/(t-1)+1/(t+2)通分,方程两边同乘以t(t+1)(t-1)(t+2):(t^2-1)(t+2)+(t^2-t)(t+2)=(t^2+t)(t+2)+t(t^2-1),化简后即为:-4t=2,得到t=-0.5则x=t-2=-2.5...
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