\(3.\left(3x-\frac{1}{2}\right)+\frac{1}{9}=0\)
ai bt giúp mình nha. Mình cần gấp
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\(\frac{1}{2}.\left(\frac{4}{3}+\frac{2}{5}\right)-\frac{3}{4}.\left(\frac{8}{9}+\frac{16}{3}\right)\)
\(=\frac{1}{2}.\left(\frac{20}{15}+\frac{6}{15}\right)-\frac{3}{4}.\left(\frac{8}{9}+\frac{48}{9}\right)\)
\(=\frac{1}{2}.\frac{26}{15}-\frac{3}{4}.\frac{56}{9}\)
\(=\frac{13}{15}-\frac{14}{3}\)
\(=-\frac{19}{5}\)
\(\frac{1}{2}.\left(\frac{4}{3}+\frac{2}{5}\right)-\frac{3}{4}.\left(\frac{8}{9}+\frac{16}{3}\right)\)
\(=\left(\frac{1}{2}.\frac{4}{3}+\frac{1}{2}.\frac{2}{5}\right)-\left(\frac{3}{4}.\frac{8}{9}+\frac{3}{4}.\frac{16}{3}\right)\)
\(=\left(\frac{2}{3}+\frac{1}{5}\right)-\left(\frac{2}{3}+4\right)\)
\(=\frac{2}{3}+\frac{1}{5}-\frac{2}{3}-4\)
\(=\frac{1}{5}-4\)
\(=\frac{1}{5}-\frac{20}{5}=\frac{-19}{5}\)
a) \(\frac{125^5}{5^{15}}=\frac{\left(5^3\right)^5}{5^{15}}=\frac{5^{15}}{5^{15}}=1\)
Mk không rảnh cho lắm !! nên chỉ làm câu a thui mấy câu khác để suy nghĩ đã
T nha
b) \(\left(\frac{2}{3}^{21}\right):\left(\frac{4}{9}^{10}\right)=\left(\frac{2}{3}^{21}\right):\left(\frac{2}{3}^2\right)^{10}=\left(\frac{2}{3}^{21}\right):\left(\frac{2}{3}^{20}\right)=\frac{2}{3}\)
\(\Leftrightarrow\left(\frac{3}{4}x-\frac{9}{16}\right)\left(\frac{1}{3}-\frac{3}{5}.\frac{1}{x}\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{4}x-\frac{9}{16}=0\\\frac{1}{3}-\frac{3}{5}.\frac{1}{x}=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{3}{4}\\x=\frac{9}{5}\end{cases}}\)
Vậy \(x\in\left\{\frac{3}{4};\frac{9}{5}\right\}\)
A) \(\frac{1}{2}\cdot\left(\frac{2}{9}+\frac{3}{7}-\frac{5}{27}\right)\)
\(=\frac{1}{2}\cdot\frac{1}{2}\)
\(=\frac{1}{4}\)
B) \(\left(\frac{-5}{28}+1.75+\frac{8}{35}\right):\left(-3\frac{9}{20}\right)\)
\(=\left(\frac{-5}{28}+\frac{7}{4}+\frac{8}{35}\right):\frac{-69}{20}\)
\(=\frac{14}{5}:\frac{-69}{20}\)
\(=\frac{-56}{69}\)
\(3.\left(3x-\frac{1}{2}\right)+\frac{1}{9}=0\)
\(3.\left(3x-\frac{1}{2}\right)=0-\frac{1}{9}\)
\(3.\left(3x-\frac{1}{2}\right)=\frac{-1}{9}\)
\(3x-\frac{1}{2}=\frac{-1}{9}:3\)
\(3x-\frac{1}{2}=\frac{-1}{27}\)
\(3x=\frac{-1}{27}+\frac{1}{2}\)
\(3x=\frac{25}{54}\)
\(x=\frac{25}{54}:3\)
\(x=\frac{25}{162}\)
~ Hok tốt ~
\(3\cdot\left(3x-\frac{1}{2}\right)+\frac{1}{9}=0\)
\(3\cdot\left(3x-\frac{1}{2}\right)=0-\frac{1}{9}\)
\(3\cdot\left(3x-\frac{1}{2}\right)=\frac{-1}{9}\)
\(3x-\frac{1}{2}=\frac{-1}{9}\div3\)
\(3x-\frac{1}{2}=\frac{-1}{27}\)
\(3x=\frac{-1}{27}+\frac{1}{2}\)
\(3x=\frac{25}{54}\)
\(x=\frac{25}{54}\div3\)
\(x=\frac{25}{162}\)
#Tề _ Thiên