(12.6+3.24÷3)×0.5
8.5×1.6﹣3.6÷0.75
×30= 0.5+ = =
= =
× ÷ × = 0.1×10÷0.1×10=
4÷ - ÷4= 101+103+105+……+199=
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]