脱式计算,能简算的要简算(要列式)
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脱式计算,能简算的要简算(要列式)
12*5/11
7.6*2又1/4+7又3/5*7又3/4
(0.75÷3-0.2)*(1-4/5)
解方程
60%x-35%x=25
12*5/11
7.6*2又1/4+7又3/5*7又3/4
(0.75÷3-0.2)*(1-4/5)
解方程
60%x-35%x=25
![脱式计算,能简算的要简算(要列式)](/uploads/image/z/1189534-22-4.jpg?t=%E8%84%B1%E5%BC%8F%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E7%AE%80%E7%AE%97%E7%9A%84%E8%A6%81%E7%AE%80%E7%AE%97%EF%BC%88%E8%A6%81%E5%88%97%E5%BC%8F%EF%BC%89)
12×5/11 = 60/11
7.6×(2×1/4)+ 7×3/5 -7×3/4
= 7.6/2 + 7×(3/5-3/4)
= 3.8 + 7×(-3/20)
= 19/5 - 21/20
=(19×4 -21 )/20
= 55/20
= 11/4 =2又3/4
(0.75÷3-0.2)×(1-4/5)
= (0.25-0.2)× (1/5) 注:0.25 - 0.2 = 0.05 = 5/100 = 1/20
=( 1/20) × (1/5)
=1/100 =0.01
60%x - 35%x = 25
25%x = 25
x = 100
7.6×(2×1/4)+ 7×3/5 -7×3/4
= 7.6/2 + 7×(3/5-3/4)
= 3.8 + 7×(-3/20)
= 19/5 - 21/20
=(19×4 -21 )/20
= 55/20
= 11/4 =2又3/4
(0.75÷3-0.2)×(1-4/5)
= (0.25-0.2)× (1/5) 注:0.25 - 0.2 = 0.05 = 5/100 = 1/20
=( 1/20) × (1/5)
=1/100 =0.01
60%x - 35%x = 25
25%x = 25
x = 100