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\(\dfrac{-7}{x+1}=\dfrac{6}{x+27}\)
\(\Rightarrow-7x-189=6x+6\)
\(\Rightarrow-7x-6x=6+189\)
\(\Rightarrow-13x=195\)
\(\Rightarrow x=-15\)
Vay x = -15
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( 7 - \(x\))3 + (11 - 7)2 = 141
(7 - \(x\))3 + 42 = 141
( 7 - \(x\))3 + 16 = 141
(7 - \(x\))3 = 141 - 16
( 7 - \(x\))3 = 125
(7 - \(x\))3 = 53
7 - \(x\) = 5
\(x\) = 7 - 5
\(x\) = 2
\(\left(7-x\right)^3+\left(11-7\right)^2=141\)
\(\left(7-x\right)^3+4^2=141\)
\(\left(7-x\right)^3+16=141\)
\(\left(7-x\right)^3=141-16\)
\(\left(7-x\right)^3=125\)
\(\left(7-x\right)=5^3\)
\(\Rightarrow7-x=5\)
\(x=7-5\)
\(x=2\)
\(\text{Vậy x=2}\)
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\(-\dfrac{5}{6}\cdot\dfrac{7}{13}+\dfrac{19}{13}:\dfrac{6}{-5}+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\cdot\dfrac{7}{13}+\dfrac{19}{13}\cdot-\dfrac{5}{6}+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\left(\dfrac{7}{13}+\dfrac{9}{13}\right)+\dfrac{2}{5}\)
\(=-\dfrac{5}{6}\cdot2+\dfrac{2}{5}\)
\(=-\dfrac{5}{3}+\dfrac{2}{5}\)
\(=-\dfrac{25}{15}+\dfrac{6}{15}\)
\(=-\dfrac{19}{15}\)
#データネ
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f) \(\dfrac{-x}{3}=2\dfrac{1}{7}\div\dfrac{5}{7}\)
\(\dfrac{-x}{3}=\dfrac{15}{7}\div\dfrac{5}{7}\)
\(\dfrac{-x}{3}=3\)
\(-x=3\cdot3\)
\(-x=9\)
\(x=-9\)
g) \(\dfrac{5}{4}+\dfrac{1}{4}\div x=1\dfrac{3}{8}\)
\(\dfrac{5}{4}+\dfrac{1}{4}\div x=\dfrac{11}{8}\)
\(\dfrac{1}{4}\div x=\dfrac{11}{8}-\dfrac{5}{4}\)
\(\dfrac{1}{4}\div x=\dfrac{1}{8}\)
\(x=\dfrac{1}{4}\div\dfrac{1}{8}\)
\(x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
TK :
5x + 5x +2 = 650
5x + 5x . 52 = 650
5x .( 1 +25 ) = 650
5x .26 = 650
5x = 650 / 26 =25
5x = 52
nên x=2
=>3x+1-x+5=6
=>2x+6=6
=>x=0