①÷×12
②1-÷0.9
③0.4×+×
④57×
⑤14×(-)×13
⑥÷(3--)
16×+16× 36×()
1÷[] 3.2×
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]
①6.4×2.5×1.25
②8.5×98%
③÷4+×
④×