1/2+0.45÷0.9 - 5/8+|0U4d0{-L;g2R0A7]
算式：提示6u7|5s9s(D'`.p4Y*H+|0U4d0{-L;g2R0A7]
=1 -5/8 =*N6v.j9n*S0b1E6[,N+|0U4d0{-L;g2R0A7]