1/【1+{1/[3+(1/X)]】=9/11,求解X=?我要过程啊.
问题描述:
1/【1+{1/[3+(1/X)]】=9/11,求解X=?我要过程啊.
答
1/【1+{1/[3+(1/X)]}】=9/11
9【1+{1/[3+(1/X)]}】=11
9+9/[3+(1/X)]=11
9/[3+(1/X)]=2
9=2[3+(1/X)]
9=6+2/x
3=2/x
x-2/3