解方程 (1)25%x=0.1 (2)40%x-1/5=60% (2)x-30%x=14(1)25%x=0.1(2)40%x-1/_数学解答

解方程 (1)25%x=0.1 (2)40%x-1/5=60% (2)x-30%x=14
(1)25%x=0.1
(2)40%x-1/5=60%
(2)x-30%x=14

人气：385 ℃　时间：2020-02-04 01:42:24

解答

1
x = 0.1/25% = 0.1/(1/4) = 4
2
x = (60% + 1/5)/40% = (3/5 + 1/5)/(2/5) = 2
3
(1-30%)x = 14
0.7x = 14
x = 20