1、53-21+9 =
2、17+2+10 =
3、13+47-18 =
4、85-(25-4) =
5、30+6-36 =
6、94+(9-3) =
7、82+2-1 =
8、82-70+64 =
9、66-21+45 =
10、97+2+1 =