脱式计算.①2700×(506﹣499)÷900; ②33.02﹣(148.4﹣90.85)÷2.5;③(1÷+÷1)÷5.1; ④(1.6×+3.6÷)×.
(1)(2)(3)(4).
脱式计算,能简算的要简算:(0.75+)÷×5% 32×1.25×0.25×101﹣ 5.8×[1÷(2.1﹣2.09)].
直接写得数7.2÷0.06= = = =10﹣0.8= 5.15+= = 3.7×101=
脱式计算(能简算的要简算)①16×2.4+3÷﹣2.4②(2+1÷3×3)÷3.5﹣0.01.
直接写出得数.= 1.2﹣1.2×= = =0.22= 10﹣0.01= 2.08÷0.25÷4= 2.5×4÷2.5×4=