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`-3/5xx9/14-3/5xx5/14+3/5`
`=(-3/5+3/5)xx(9/14+5/14)xx3/5`
`=0xx14xx3/5`
`=0xx1xx3/5`
`=0xx3/5`
`=0`
`@Nae`
\(\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow\frac{x+y}{4+3}=\frac{x}{4}=\frac{y}{3}\) mà x + y = 14
\(\Rightarrow\frac{14}{7}=\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow2=\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow\hept{\begin{cases}x=2\cdot4=8\\y=2\cdot3=6\end{cases}}\)
a: =>x/27+1=-2/3
=>x/27=-5/3
=>x=-45
b: \(\Leftrightarrow x-4=\dfrac{2}{5}:\dfrac{20}{21}=\dfrac{2}{5}\cdot\dfrac{21}{20}=\dfrac{42}{100}=\dfrac{21}{50}\)
=>x=221/50
c: \(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
=>x=1/15-2/3=1/15-10/15=-9/15=-3/5
d: \(\Leftrightarrow x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{15}{14}\cdot\dfrac{21}{20}\)
=>\(x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{3}{2}\cdot\dfrac{3}{4}=\dfrac{1}{5}-\dfrac{9}{8}=\dfrac{-37}{40}\)
=>x=-37/24
e: =>-3/7x=84/45
=>x=-196/45
f: =>11/10x=-2/3
=>x=-20/33
1/ Ta xem phần này trước: \(-\frac{6}{y}=\frac{6}{7}\left(rutgon\right)\)
\(\Rightarrow y=7.\left(-6\right):6=-7\)
Quay lại lúc đầu: \(\frac{x}{14}=\frac{6}{7}\)
\(\Rightarrow x=6.14:7=12\)
2/ \(\Leftrightarrow x-\frac{14}{x}=-3+\frac{2}{3}\)
\(\Leftrightarrow\frac{3x-2}{3}=-\frac{7}{3}\left(quydong\right)\)
\(\Leftrightarrow3x-2=-7\)
Giải nốt hộ nha lười quá
\(\frac{x}{14}=\frac{-6}{y}=\frac{6}{7}\)
Ta có :\(\frac{-6}{y}=\frac{6}{7}\)=>\(y=\frac{-6.7}{6}=-7\)
\(\frac{x}{14}=\frac{6}{7}\)=>\(x=\frac{6.14}{7}\)=12
2/\(\frac{x-2}{3}=\frac{14}{x-3}\)
=>(x-2).(x-3)=14.3=42
Tự làm nhé
đề rối
\(x+\frac{3}{10}+x+\frac{3}{11}+x+\frac{3}{12}=x+\frac{3}{13}+x+\frac{3}{14}\)
\(\Leftrightarrow3x+\left(\frac{3}{10}+\frac{3}{11}+\frac{3}{12}\right)=2x+\left(\frac{3}{13}+\frac{3}{14}\right)\)
\(\Leftrightarrow3x+\frac{181}{220}=2x+\frac{81}{182}\)
\(\Leftrightarrow3x-2x=-\frac{181}{220}+\frac{81}{182}\)
\(\Leftrightarrow x=-\frac{181}{220}+\frac{81}{182}=\frac{-7561}{20020}\)
hay là
\(\frac{x+3}{10}+\frac{x+3}{11}+\frac{x+3}{12}=\frac{x+3}{13}+\frac{x+3}{14}\)
\(\Leftrightarrow\frac{x+3}{10}+\frac{x+3}{11}+\frac{x+3}{12}-\frac{x+3}{13}+\frac{x+3}{14}=0\)
\(\Leftrightarrow\left(x+3\right)\left(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}-\frac{1}{13}+\frac{1}{14}\right)=0\)
\(\Leftrightarrow x+3=0\)( vì \(\left(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}-\frac{1}{13}+\frac{1}{14}\right)\ne0\))
\(\Rightarrow x=-3\)
1, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 43 + 15
\(x\) = 58
2, (-14) + \(x\) - 7 = -10
-14 + \(x\) - 7 = -10
- 21 + \(x\) = - 10
\(x\) = -10 + 21
\(x\) = 11
3.x+27.6=14.(-3)
3.x+27.6=-42
3.x+162=-42
3.x =-42-162
3.x =-204
x =-204:3
x = -68
Học tốt!