问题标题:
初二下数学分式方程计算题[(x-4)/(x^2-1)]÷[(x^2-3x-4)/(x^2+2x+1)]+(1/x-1)其中x=2√2+1
问题描述:
初二下数学分式方程计算题
[(x-4)/(x^2-1)]÷[(x^2-3x-4)/(x^2+2x+1)]+(1/x-1)
其中x=2√2+1
冯小群回答:
[(x-4)/(x^2-1)]÷[(x^2-3x-4)/(x^2+2x+1)]+(1/x-1)
=(x-4)/[(x+1)(x-1)×(x+1)²/[(x-4)(x+1)]+1/(x-1)
=1/(x-1)+1/(x-1)
=2/(x-1)
2/2√2
=√2/2
点击显示
数学推荐
热门数学推荐