直接写得数:0.06×0.25= 0.8×1.25= 10﹣0.01= 8.1÷0.03=3×0.2×0.5= 0.25×16= 0.35÷0.7= 8.4÷0.2+1.6×0.21=7.2×0.3+2.8×0.3= 1.2×0.4+1.3×0.4=
用简便方法计算. (1)3.14×+3.14×(2)×25%+×2.2 (3)87.5×19﹣87.5×8﹣87.5(4)0.77×(+)
用简便方法计算 (1)0.25×32×0.5(2)×17﹣12× (3)18×(+﹣+)(4)(50×49×48)÷(25×24)
脱式计算,能简算的要简算 4﹣(2﹣)×4+5÷1+1125﹣996 9.63÷2.5÷4.
选用合适的方法计算下面各题 200.9×10%+2.009×490+0.2009×5000 [﹣(﹣)]× (++)×24+++++++.
看谁算得巧. ①75.5﹣8.25﹣12.75②÷[×(0.5+)]③43﹣43×0.9④÷﹣×6.