（4.6÷5+0.4×0.2）×2.8)C9S.d4K5?9S0r;W
算式：提示6]4r)a,s*B+v'u:Y)C9S.d4K5?9S0r;W
=2}7j.X0Z7[;Y-N4h7z(J)C9S.d4K5?9S0r;W