计算-O5s5E(u'h-U2K,?2{'_5o,r
999×999＋2999-O5s5E(u'h-U2K,?2{'_5o,r
算式：提示3s4`;T;E)l)r3U+@;v5v9d/a-O5s5E(u'h-U2K,?2{'_5o,r
=)g-z7p:^:^/_-O5s5E(u'h-U2K,?2{'_5o,r