27^2.8^5/6^6.32^3
giải chi tiết giúp mk vs nha
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\(\frac{27^2.8^5}{6^6.32^3}=\frac{\left(3^3\right)^2.\left(2^3\right)^5}{2^6.3^6.\left(2^5\right)^3}\)
\(=\frac{3^6.2^{15}}{2^6.3^6.2^{15}}\)
\(=\frac{1}{2^6}\)
\(\frac{27^2.8^5}{6^6.32^3}=\frac{\left(3^3\right)^2.\left(2^3\right)^5}{\left(2.3\right)^6.\left(2^5\right)^3}=\frac{3^6.2^{15}}{2^6.3^6.2^{15}}=\frac{1}{2^6}=\frac{1}{64}\)
\(2\sqrt{48}-3\sqrt{75}+5\sqrt{3}\)
\(=2\sqrt{16.3}-3\sqrt{25.3}+5\sqrt{3}\)
\(=2\sqrt{4^2.3}-3\sqrt{5^2.3}+5\sqrt{3}\)
\(=2.4\sqrt{3}-3.5\sqrt{3}+5\sqrt{3}\)
\(=8\sqrt{3}-15\sqrt{3}+5\sqrt{3}\)
\(=\left(8-15+5\right).\sqrt{3}\)
\(=-2\sqrt{3}\)
\(-\dfrac{1}{2}x+6< 0\Leftrightarrow-\dfrac{1}{2}x< -6\Leftrightarrow\cdot\dfrac{1}{2}x>6\Leftrightarrow x>12\)
(sai thì thoi nha)
\(-\dfrac{1}{2}x+6< 0\)
\(\Leftrightarrow-\dfrac{1}{2}x< -6\)
\(\Leftrightarrow x>\left(-6\right):\left(-\dfrac{1}{2}\right)\)
\(\Leftrightarrow x>12\)
--> Chọn A
a: \(=\dfrac{-3^4\cdot2^8}{2^2\cdot2^2\cdot3^2}=-3^2\cdot2^2=-6^2=-36\)
b: \(=\dfrac{3^6\cdot2^{15}}{3^6\cdot2^6\cdot2^{15}}=\dfrac{1}{2^6}=\dfrac{1}{64}\)
c: \(=\left(\dfrac{0.8}{0.4}\right)^5\cdot\dfrac{1}{0.4}=2^5\cdot\dfrac{1}{0.4}=\dfrac{32}{0.4}=80\)