1.2+0.26= 0.03÷0.4= 1÷150%= 25×4÷25×4=
- = 3÷ = 16×( × )= + + + =
n
0
1
2
3
4
5
6
……
2n
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]