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\(\dfrac{2}{5}+x+20\%=\dfrac{69}{10}\\ \Rightarrow\dfrac{2}{5}+x+\dfrac{1}{5}=\dfrac{69}{10}\\ \Rightarrow\dfrac{3}{5}+x=\dfrac{69}{10}\\ \Rightarrow x=\dfrac{69}{10}-\dfrac{3}{5}\\ \Rightarrow x=\dfrac{63}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
TL
X - \(\frac{1}{4} = \frac{7}{2} x \frac{-3}{5}\)
X - \(\frac{1}{4}=\frac{-21}{10}\)
X =\(\frac{-21}{10} + /frac{1}{4}\)
X =\frac{-37}{20}\)
nha bn
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
TL
\(\frac{x+5}{36} = \frac{4}{x+5}\)
=> (x+5)(x+5)=36x4
=> (x+5)^2=144
=>(x+5)^2=12^2 hoặc (x+5)=-12^2
=>x+5=12 x+5=-12
=> x=12-5 x=-12-5
=> x=7 x=-17
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\left(5-x\right)^{2018}-\left(5-x\right)^{2019}=0\)
\(\Leftrightarrow\left(5-x\right)^{2018}\left[x-\left(5-x\right)\right]=0\Leftrightarrow\left(5-x\right)^{2018}\left(2x-5\right)=0\Leftrightarrow x=5;x=\dfrac{5}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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26/42 = 13/21
56/78 = 28/36 = 7/9
Mà 13/21 = 117/189, 7/9 = 91/189
Nên : 26/42 > 56/78
TL
2x - \(\frac{3}{4}\) = \(\frac{55}{20}\)
2x = \(\frac{55}{20}+\frac{3}{4}\)
2x = \(\frac{7}{2}\)
x = \(\frac{7}{2}:2\)
x = \(\frac{7}{4}\)
HT
2x - 3/4 = 55/60
2x = 55/60 + 3/4
2x = 5/3
x = 5/3 : 2
x = 5/6
Chúc bạn học tốt.
😁😁😁