求表面积和体积(单位:cm.)
脱式计算(315+285)÷(315﹣255)5﹣(÷+)(+﹣)×36.3.3×+0.75×3.7+75%×3.
脱式计算(能简算的要简算).(1)12.5×(36﹣7.2)÷3.6 (2)33.33×3334+22.22×9999(3)8.4×2012.1+(2012.1+12.5)×1.6(4)7.5×2.3+1.9×2.5+12.5×0.4(5)(1+1.2)+(2+1.2×2)+(3+1.2×3)+…+(99+1.2×99)+(100+1.2×100)
下面每题,怎样算简便就怎样算36.8﹣6.8÷0.5 0.125×32×0.25 1.25×8.873÷4+2.7×0.25 3.75÷[0.3×(1.34﹣0.84)].
计算,能简算的要简算.0.32×2.5×12.5 3.6×0.81+0.36×1.9 4.05÷[1.8×(3.36﹣2.86)].
计算下面各题,能简算的要简算.5.95÷(1.2+0.5)×5 75÷(0.75×4)0.8×0.68×125 73.5×0.1+7.35×9.