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\(\dfrac{x}{5}=\dfrac{5}{6}-\left(-\dfrac{19}{30}\right)\\ =>\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{19}{30}\\ =>\dfrac{x}{5}=\dfrac{25}{30}+\dfrac{19}{30}\\ =>\dfrac{x}{5}=\dfrac{44}{30}\\ =>\dfrac{x}{5}=\dfrac{22}{15}\\ =>15x=22.5\\ =>15x=110\\ =>x=110:15\\ =>x=\dfrac{22}{3}\)
\(\Leftrightarrow\dfrac{x}{5}=\dfrac{1}{5}\\ \Leftrightarrow x=\dfrac{5.1}{5}=\dfrac{5}{5}=1\)
\(\frac{5}{6}+\frac{\left(-19\right)}{30}=\frac{x}{5}\)
\(\frac{25}{30}+\frac{\left(-19\right)}{30}=\frac{x}{5}\)
\(\frac{6}{30}=\frac{x}{5}\)
\(\frac{1}{5}=\frac{x}{5}\)
\(\Rightarrow5x=5\times1\)
\(5x=5\)
\(x=5\div5\)
\(x=1\)
\(\frac{5}{6}+\frac{-19}{30}=\frac{x}{5}\)
\(\Leftrightarrow\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}\)
\(\Leftrightarrow\frac{x}{5}=\frac{25}{30}+\frac{-19}{30}\)
\(\Leftrightarrow\frac{x}{5}=\frac{6}{30}\)
\(\Leftrightarrow\frac{x}{5}=\frac{1}{5}\)
\(\Rightarrow x=1\)
Vậy \(x=1\)
x/5 = 5/6 + -19/ 30
=> x/5 = 25/30 + -19/30
=> x/5 = 6/30
=> x/5 = 1/5
=> x = 1 ( vì mẫu số = 5 )
Vậy x = 1
Chúc bạn học giỏi !!!
\(\frac{x}{5}=\frac{5}{6}+-\frac{19}{30}\)
\(\Rightarrow\frac{x}{5}=\frac{1}{5}\)
\(\Rightarrow x=1\)
học tốt ~~~~
x = 5/6 + (-19)/30
x = 25/30 + (-19)/30
x = 6/30
x = 1/5 (t/m)
Kết luận:....
Chúc bạn học tốt, nhớ nha.
a) \(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
\(\Rightarrow\dfrac{x}{3}=\dfrac{11}{21}\)
\(\Rightarrow x=\dfrac{3\cdot11}{21}\)
\(\Rightarrow x=\dfrac{33}{21}\)
\(\Rightarrow x=\dfrac{11}{7}\)
b) \(\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{-19}{30}\)
\(\Rightarrow\dfrac{x}{5}=\dfrac{1}{5}\)
\(\Rightarrow x=\dfrac{5\cdot1}{5}\)
\(\Rightarrow x=1\)
\(\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-5}{12}+\frac{1}{4}+\frac{1}{6}\right)\)
\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-5}{12}+\frac{3}{12}+\frac{2}{12}\right)\)
\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-2}{12}+\frac{2}{12}\right)\)
\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).0\)
\(=0\)
Ta có: x5=56−1930
⇔x5=2530−1930
⇔x5=630=15
hay x=1
Vậy: x=1