2 - 6/13÷9/26 - 2/3.K6Z/|*^5I4\4R
算式：提示;X8B4@+j+j9\5M/Q8g1z/o(x.K6Z/|*^5I4\4R
=;N6z2V9P.K6Z/|*^5I4\4R