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d) \(\frac{x}{-9}=\left(\frac{2}{6}\right)^2\)
\(\Rightarrow\frac{x}{-9}=\frac{2}{6}.\frac{2}{6}\)
\(\Rightarrow\frac{x}{-9}=\frac{4}{36}\)
\(\Rightarrow\frac{x}{-9}=\frac{1}{9}\)
\(\Rightarrow\frac{-x}{9}=\frac{1}{9}\)
\(\Rightarrow-x=1\)
\(\Rightarrow x=1\)
e) \(\frac{a}{b}+\frac{3}{6}=0\)
\(\Rightarrow\frac{a}{b}=0-\frac{3}{6}\)
\(\Rightarrow\frac{a}{b}=0-\frac{1}{2}\)
\(\Rightarrow\frac{a}{b}=\frac{-1}{2}\)
\(\Rightarrow a=-1;b=2\)
a,\(\frac{25}{42}-\frac{20}{63}=\frac{5}{18}\)
b,\(\frac{9}{50}-\frac{13}{75}-\frac{1}{6}\)
=\(\frac{1}{150}-\frac{1}{6}\)
=\(-\frac{4}{25}\)
c,\(\frac{2}{15}+\frac{-2}{65}-\frac{4}{39}\)
=\(\frac{32}{195}-\frac{4}{39}\)
=\(\frac{4}{65}\)
a,=75/126-40/126=35/126=5/18
b,=27/150-26/150-25/150=-4/25
c,=26/195+-6/195-20/195=0
a)\(11\frac{1}{4}-\left(2\frac{5}{7}+5\frac{1}{4}\right)\)
\(=\frac{45}{4}-\left(\frac{19}{7}+\frac{21}{4}\right)\)
\(=\frac{45}{4}-\left(\frac{76}{28}+\frac{147}{28}\right)\)
\(=\frac{45}{4}-\frac{223}{28}\)
\(=\frac{315}{28}-\frac{223}{28}\)
\(=\frac{23}{7}\)
b) \(\left(8\frac{5}{11}+3\frac{5}{8}\right)-3\frac{5}{11}\)
\(=\left(\frac{93}{11}+\frac{29}{8}\right)-\frac{38}{11}\)
\(=\left(\frac{744}{88}+\frac{319}{88}\right)-\frac{38}{11}\)
\(=\frac{1063}{88}-\frac{38}{11}=\frac{1063}{88}-\frac{304}{88}\)
\(=\frac{69}{8}\)
a)\(\left(2x+\frac{3}{5}\right)^2-\frac{9}{25}=0\)
\(\Leftrightarrow\left(2x+\frac{3}{5}\right)^2-\left(\frac{3}{5}\right)^2=0\)
\(\Leftrightarrow\left(2x+\frac{3}{5}+\frac{3}{5}\right)\left(2x+\frac{3}{5}-\frac{3}{5}\right)=0\)
\(\Leftrightarrow\left(2x+\frac{6}{5}\right).2x=0\)
\(\Leftrightarrow\left[\begin{matrix}x=-\frac{3}{5}\\x=0\end{matrix}\right.\)
Kết luận thôi
b) \(3.\left(3x-\frac{1}{2}\right)^3+\frac{1}{19}=0\)
\(\Leftrightarrow\left(3x-\frac{1}{2}\right)^3=-\frac{1}{19}:3\)
\(\Leftrightarrow\left(3x-\frac{1}{2}\right)^3=-\frac{1}{57}\)
\(\Leftrightarrow3x-\frac{1}{2}=\sqrt[3]{-\frac{1}{57}}\)
\(\Leftrightarrow3x=\sqrt[3]{-\frac{1}{57}}+\frac{1}{2}\)
\(\Leftrightarrow x=\frac{\sqrt[3]{-\frac{1}{57}}+\frac{1}{2}}{3}\)
Số hơi to
Kết luận thôi
\(\frac{3}{6}+\frac{-7}{35}+\frac{-25}{35}+\frac{-3}{35}+\frac{1}{6}+\frac{2}{6}+\frac{1}{41}\)\(\frac{1}{41}\)
\(=\left(\frac{2}{6}+\frac{1}{6}+\frac{3}{6}\right)+\left(\frac{-25}{35}+\frac{-7}{35}+\frac{-3}{35}\right)+\frac{1}{41}\)
\(=1+\left(-1\right)+\frac{1}{41}\)
\(=0+\frac{1}{41}\)
\(=\frac{1}{41}\)
k cho minh minh dang can no gap
a) \(\dfrac{145}{27}\)
b) \(\dfrac{8}{9}\)