356+198= 2.5×4= 59×31≈
315÷3=
(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=