计算：4\:Q9U.@(e(S0M)c7[9m0]5|
1400+500=3Y*K2B4P:F)d4\:Q9U.@(e(S0M)c7[9m0]5|
算式：提示*D9W4R1J'c4\:Q9U.@(e(S0M)c7[9m0]5|