(1/3+1/4)÷1/21=(1/3+1/4)×21=7+21/4=49/4
2/7×40%+5/7×40%=(2/7+5/7)×40%=1×40%=40%
52÷8/9×2/9=52×9/8×2/9=52×1/4=13
65-40÷5/3×12.5%=65-40×3/5×12.5%=65-40×12.5%×3/5=65-5×3/5=65-3=62
65×3/4+3.5×7.5=65×0.75+35×0.75=(65+35)×0.75=100×0.75=75
(1/2-1/3×75%)÷0.25=(1/2-1/3×3/4)÷1/4=(1/2-1/4)×4=2-1=1
简便方法计算:(3分之1+4分之1)÷21分之1 7分之2×40%+7分之5×40%
简便方法计算:(3分之1+4分之1)÷21分之1 7分之2×40%+7分之5×40%
52÷9分之8×9分之265-40÷3分之5×12.5% 65×4分之3+3.5×7.5 (2分之1-3分之1×75%)÷0.25
52÷9分之8×9分之265-40÷3分之5×12.5% 65×4分之3+3.5×7.5 (2分之1-3分之1×75%)÷0.25
数学人气:159 ℃时间:2019-11-16 13:04:16
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