计算：5`6s4w9r.j6t:f2L
4723-（723＋189）5`6s4w9r.j6t:f2L
算式：提示;F.~8j:T+F2t5`6s4w9r.j6t:f2L
=3O:w+w)z+\7Z'|5`6s4w9r.j6t:f2L