某工厂每天节约用水2吨，求3﹣5月份一共节约用水多少吨？
口算题435+199= 16×0.2= 12= 4×25%= 2﹣2÷5= = = 5.5×1.6+1.6×4.5=
9﹣（+）×24．
脱式计算，能简便计算的要简算．13÷0.4÷2.5 1.25×2.5×0.8 1.5×101﹣1.5 4.8×101．
①245﹣65﹣35 ②9.8+2.5+10.2+7.5 ③1.25×32×2.5．
下面各题怎样算简便就怎样算．5.44+17.8+4.56 24.8﹣3.89﹣7.1147.8﹣（17.8+0.96）16.78﹣6.5+3.22﹣3.5．
= 4×25%= 
= 
= 5.5×1.6+1.6×4.5=
+
）×24．
粤公网安备 44130202000953号