x-0.1x+72=x-0.05x怎么解方程?

2024-12-17 05:43:27
推荐回答(2个)
回答1:

解:解方程,此方程的解为x = 1440

x - 0.1x + 72 = x - 0.05x

(10/10)x - (1/10)x + 72 = x - ( 5/100)x
(9/10)x + 72 = (20/20)x - (1/20)x
(9/10)x + 72 = (19/20)x
(19/20)x - (9/10)x = 72
(19/20)x - (18/20)x = 72
(1/20)x = 72
x = 72 ÷ 1/20
x = 72 × 20
∴x = 1440
答:此方程的解为x = 1440

回答2:

x-0.1x+72=x-0.05x
0.9x+72=0.95x
0.95x-0.9x=72
0.05x=72
x=72÷0.05
x=1440