1)873-689=184
2)1845:15=123
3)184*12=2208
4)123+2208=2331
5)2331:21=111
6)111-109=2
---------------------------
1)506:23=22
2)58-22=36
3)101*27=2727
4)2727-2685=42
5)36*42=1512
6)1512+1748=3260
7)3260:163=20
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1)873-689=184
2)1845:15=123
3)184*12=2208
4)123+2208=2331
5)2331:21=111
6)111-109=2
---------------------------
1)506:23=22
2)58-22=36
3)101*27=2727
4)2727-2685=42
5)36*42=1512
6)1512+1748=3260
7)3260:163=20