![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
`(13+x)/20 = 3/4`
`(13+x) xx4=3xx20`
`(13+x)xx4=60`
`13+x=60:4`
`13+x=15`
`x=15-13`
`x=2`
__
`(23-x)/25 =4/5`
`(23-x)xx5=4xx25`
`(23-x)xx5=100`
`23-x=100:5`
`23-x=20`
`x=23-20`
`x=3`
![](https://rs.olm.vn/images/avt/0.png?1311)
b) \(23-\frac{x}{25}=\frac{4}{5}\)
\(\frac{x}{25}=23-\frac{4}{5}\)
\(\frac{x}{25}=\frac{111}{5}=\frac{555}{25}\)
=> x = 555
![](https://rs.olm.vn/images/avt/0.png?1311)
13+\(\frac{x}{20}\)=\(\frac{3}{4}\)
=>\(\frac{x}{20}\)=\(\frac{3}{4}-13\)
=>\(\frac{x}{20}=\frac{3}{4}-\frac{52}{4}=-\frac{49}{4}=-\frac{245}{20}\)
=>x=-245
\(23-\frac{x}{25}=45\)
\(=>\frac{x}{25}=23-45=-22=-\frac{550}{25}\)
=>x=-550
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{13+x}{20}=\frac{3}{4}\)
\(\Rightarrow\frac{13+x}{20}=\frac{15}{20}\)
\(\Rightarrow13+x=15\)
\(\Rightarrow\) \(x=15-13\)
\(\Rightarrow\)\(x=2\)
b)\(\frac{23-x}{25}=\frac{4}{5}\)
\(\Rightarrow\frac{23-x}{25}=\frac{20}{25}\)
\(\Rightarrow23-x=20\)
\(\Rightarrow\) \(x=23-20\)
\(\Rightarrow\) \(x=3\)
a, 13+x/20= 3/4
Suy ra: ( 13+x). 4= 20.3
Suy ra: (13+x).4=60
Suy ra: 13+x=60:4
Suy ra: 13+x=15
Suy ra: x=15-13
Suy ra: x=2
Vậy x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(13+\frac{x}{20}=\frac{3}{4}\Leftrightarrow\frac{x}{20}=\frac{3}{4}-13\Leftrightarrow\frac{x}{20}=-12\frac{1}{4}\)
\(\Leftrightarrow\frac{x}{20}=-\frac{49}{4}\Leftrightarrow4x=20\cdot\left(-49\right)\Leftrightarrow4x=-980\)
\(\Leftrightarrow x=\left(-980\right):4\Leftrightarrow x=-245\)
\(23-\frac{x}{25}=\frac{4}{5}\Leftrightarrow\frac{x}{25}=23-\frac{4}{5}\Leftrightarrow\frac{x}{25}=22\frac{1}{5}\)
\(\Leftrightarrow\frac{x}{25}=\frac{111}{5}\Leftrightarrow5x=25\cdot111\Leftrightarrow5x=2775\)
\(\Leftrightarrow x=2775:5\Leftrightarrow x=555\)
a)13+x/20=3/4 b)23-x/25=4/5
x/20=3/4-13 x/25=23-4/5
x/20=-12,25 x/25=22,2
x=-245 x=555
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{13+x}{20}=\frac{3}{4}\)
\(\Rightarrow\left(13+x\right).4=3.20\)
\(\Rightarrow\left(13+x\right).4=60\)
=> 13 + x = 60 : 4
=> 13 + x = 5
=> x = 5 - 13
=> x = -8
\(\frac{22-x}{25}=\frac{4}{5}\)
=> (22 - x) . 5 = 4 . 25
=> (22 - x) .5 = 100
=> 22 - x = 100 : 5
=> 22 - x = 20
=> x = 22 - 20
=> x = 2
Câu 1 sai đề.
Câu 2:
\(23-\frac{x}{25}=\frac{4}{5}\)
\(\frac{x}{25}=\frac{111}{5}\)
\(x=555\)
Câu 2:
23−x25=4523−x25=45
x25=1115x25=1115
x=555