4.用递等式计算
0 159898 159906 159912 159916 159922 159924 159928 159934 159936 159942 159948 159952 159954 159958 159964 159966 159972 159976 159978 159982 159984 159988 159990 159992 159993 159994 159996 159997 159998 160000 160002 160006 160008 160012 160014 160018 160024 160026 160032 160036 160038 160042 160048 160054 160056 160062 160066 160068 160074 160078 160084 160092 199269
280-(490-390) | (209+99)×52 | 4578÷6×15 |
7000-208×12 | 45×(27+35) | (948-196)×14 |