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\(\dfrac{x}{5}=\dfrac{26}{65}\)
\(\dfrac{x}{5}=\dfrac{2}{5}\)
\(x=2\)
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\(\dfrac{3}{x}=\dfrac{51}{85}\)
\(\dfrac{3}{x}=\dfrac{3}{5}\)
`x=5`
![](https://rs.olm.vn/images/avt/0.png?1311)
P/s : Đúng nha
\(\frac{15}{17}\times\frac{51}{5}< x< \frac{67}{9}+\frac{35}{9}\)
\(\Rightarrow9< x< \frac{102}{9}\)
\(\Rightarrow9< x< 12\)
\(\Rightarrow x=10\)hoặc \(x=11\)
Vậy \(x=10\)hoặc \(x=11\)
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\(\frac{3}{7}\)<\(\frac{1}{2}\)<\(\frac{3}{5}\)
\(\frac{3}{2}\)>\(\frac{3}{4}\)>\(\frac{2}{3}\)>\(\frac{1}{5}\)
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\(\dfrac{x}{5}=\dfrac{26}{65}\)
\(\Leftrightarrow65x=130\)
\(\Leftrightarrow x=2\)
\(\dfrac{3}{x}=\dfrac{51}{85}\)
\(\Leftrightarrow51x=255\)
\(\Leftrightarrow x=5\)
`x/5=26/65`
`65xx x=5xx26`
`65xx x=130`
`x=130:65=2`
`3/x=51/85`
`51xx x=3xx85`
`51xx x=255`
`x=255:51=5`
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mẫu số bằng nhau thì khỏi nói nhé . ta thấy : 50 + 1 = 51 ; 49 + 2 = 51 ; .... ; 25 + 26 = 51 . có tất cả 25 cặp như thế . tổng của các tử số là : 25 x 51 = 1275 . 50/51 + 49/51 + 48/51 + ... + 1/51 = 1275/51 = 25 .
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a: 15/x=10/15
nên x=22,5
b: 3/x=51/85
=>3/x=3/5
hay x=5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,\dfrac{x}{4}=\dfrac{15}{20}\\ \Rightarrow\dfrac{x}{4}=\dfrac{3}{4}\\ \Rightarrow x=3\\ b,\dfrac{15}{x}=\dfrac{25}{35}\\ \Rightarrow\dfrac{15}{x}=\dfrac{5}{7}\\ \Rightarrow\dfrac{15}{x}=\dfrac{15}{21}\\ \Rightarrow x=21\\ c,\dfrac{x}{5}=\dfrac{26}{65}\\ \Rightarrow\dfrac{x}{5}=\dfrac{2}{5}\\ \Rightarrow x=2\\ d,\dfrac{3}{x}=\dfrac{51}{85}\\ \Rightarrow\dfrac{3}{x}=\dfrac{3}{5}\\ \Rightarrow x=5\)
a,x4=1520⇒x4=34⇒x=3b,15x=2535⇒15x=57⇒15x=1521⇒x=21c,x5=2665⇒x5=25⇒x=2d,3x=5185⇒3x=35⇒x=5
3:x=51/85
3:x=3:5
x=5
5
tk nha