①18.2×37.5%+5.8×
②48×()
③
18x+2x=60
=
10001-999≈
20.97÷3.01≈
+70%= 0.252= ×÷×= :=
①( )×36
②
③3.36×5.7+66.4×0.57
④12.5×25× ×4