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câu trả lời đây
- (\(\frac{3}{5}x-0,75\)):\(\frac{3}{7}=\frac{14}{5}\)
- ( \(\frac{3}{5}x-\frac{75}{100}\))\(:\frac{3}{7}=\frac{14}{5}\)
- (\(\frac{3}{5}x-\frac{3}{4}\))\(:\frac{3}{7}=\frac{14}{5}\)
- bí rồi ai giúp mình giải thêm nhé
(3x/5 - 3/4):3/7 =14/5
(3x/5-3/4).7/3 =21x/15 - 21/12 = 14/5
21x =( 14/5 +21/12).15
21x = 273/4
x = 13/4
đã làm là đúng
x =
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1
2/5 - 3/5 : (0,75 + 30%)
= 2/5 - 3/5 : 21/20
= 2/5 - 4/7
= -6/35
‐--------------------
Bài 2
a) x/6 = -11/3
x = -11/3 . 6
x = -22
b) 16/5 của x là 48
x = 48 : 16/5
x = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,-\dfrac{3}{5}-x=-0,75\\ -\dfrac{3}{5}-x=-\dfrac{3}{4}\\ x=-\dfrac{3}{5}-\left(-\dfrac{3}{4}\right)\\ x=-\dfrac{3}{5}+\dfrac{3}{4}=\dfrac{3}{20}\\ ---\\ b,1\dfrac{4}{5}=-0,15-x\\ \dfrac{9}{5}=-\dfrac{3}{20}-x\\ x=-\dfrac{3}{20}-\dfrac{9}{5}\\ x=-\dfrac{3}{20}-\dfrac{36}{20}\\ x=-\dfrac{39}{20}\\ ----\\ c,2\dfrac{1}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}-\left(-\dfrac{4}{7}\right)\\ \dfrac{5}{2}-x+\dfrac{4}{5}=\dfrac{2}{3}+\dfrac{4}{7}\\ \dfrac{33}{10}-x=\dfrac{26}{21}\\ x=\dfrac{33}{10}-\dfrac{26}{21}\\ x=\dfrac{433}{210}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{6}x+\frac{1}{2}-\frac{1}{3}x=0,75x-\frac{7}{8}\)
\(\frac{5}{6}x-\frac{1}{3}x-0,75x=-\frac{7}{8}-\frac{1}{2}\)
\(\frac{5}{6}x-\frac{1}{3}x-\frac{3}{4}x=-\frac{11}{8}\)
\(\frac{1}{2}x-\frac{3}{4}x=-\frac{11}{8}\)
\(-\frac{1}{4}x=-\frac{11}{8}\)
\(x=-\frac{11}{8}:-\frac{1}{4}\)
\(x=\frac{11}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có: 36-x=44
nên x=36-44=-8
Vậy: x=-8
b) Ta có: \(\dfrac{5}{6}-x=\dfrac{7}{4}-0.75-3\)
\(\Leftrightarrow\dfrac{5}{6}-x=\dfrac{7}{4}-\dfrac{3}{4}-3=1-3=-2\)
hay \(x=\dfrac{5}{6}+2=\dfrac{17}{6}\)
a) 36-x=44 b) 5/6-x=7/4-0,75-3
=> x= 36-44 => 5/6-x= -2
=> x= -8 => x= 5/6-(-2)
=> x=17/6
`@` `\text {Ans}`
`\downarrow`
\(-\dfrac{3}{5}-x=0,75\)
\(\Rightarrow x=-\dfrac{3}{5}-0,75\)
\(\Rightarrow x=-\dfrac{27}{20}\)
Vậy, `x = `\(-\dfrac{27}{20}\)