13.34+2x等于20.9怎么解方程?

怎么做?
2025-02-27 01:19:45
推荐回答(2个)
回答1:

解:解方程, 此方程的解为x = 189/50,【即x = 3.78】
13.34 + 2x = 20.9
(13×100+34)/100 + 2x = (20×10+9)/10
1334/100 + 2x = 209/10
667/50 + 2x = 209/10
2x = 209/10 - 667/50
2x = 1045/50 - 667/50
2x = 378/50
2x = 189/25
x = 189/25 ÷ 2
x = 189/25 × 1/2
x = 189/50
∴x = 3.78
答:此方程的解为x = 189/50,【即x = 3.78】

回答2:

移项2x=20.9-13.34
合并同类项2x=7.56
方程两边同除以2。
x=3.78