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a) ( 0,5 )6 = \(\frac{5^6}{10^6}=\left(\frac{5}{10}\right)^6=\left(\frac{1}{2}\right)^6\)
( 0,5 )9 = \(\frac{5^9}{10^9}=\left(\frac{5}{10}\right)^9=\left(\frac{1}{2}\right)^9\)
vì \(\left(\frac{1}{2}\right)^6>\left(\frac{1}{2}\right)^9\)nên \(\left(0,5\right)^6>\left(0,5\right)^9\)
b) vì ( -0,125)8 = ( 0,125 )8 = ( 0,5 )24
=> ( -0,125 )8 = ( 0,5 )24
c) \(\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{0,625-0,5+\frac{5}{11}+\frac{5}{12}}=\frac{3\left(0,125-0,1+\frac{1}{11}+\frac{1}{12}\right)}{5\left(0,123-0,1+\frac{1}{11}+\frac{1}{12}\right)}=\frac{3}{5}\)
a: \(=0.5\cdot10-\dfrac{1}{7}+15=20-\dfrac{1}{7}=\dfrac{139}{7}\)
b: \(=6\cdot\dfrac{-2}{3}+12\cdot\dfrac{4}{9}+18\cdot\dfrac{-8}{27}\)
\(=-4+\dfrac{16}{3}-\dfrac{16}{3}=-4\)
c: \(=\left(\dfrac{5}{2}+\dfrac{3}{8}-\dfrac{5}{8}+\dfrac{2}{3}\right):\left(\dfrac{17}{2}+\dfrac{49}{4}-\dfrac{17}{8}+\dfrac{34}{15}\right)\)
\(=\dfrac{35}{12}:\dfrac{2507}{120}=\dfrac{350}{2507}\)
a) \(\left(-0,6\right)^6\cdot x=\left(\frac{-3}{5}\right)^8\)
\(x=\left(\frac{-3}{5}\right)^8:\left(\frac{-3}{5}\right)^6\)
\(x=\left(-\frac{3}{5}\right)^2=\frac{9}{25}\)
b) \(\left(0,5-x\right)^3=-8=\left(-2\right)^3\)
\(\Leftrightarrow0,5-x=-2\)
\(\Leftrightarrow x=2,5\)
Vậy,.................
a) 63
36 = 32.3 = ( 32)3 = 93
Do 6 < 9 nên 63 < 93 hay 63 < 36
^^
a) 63 = 63
36 =( 32)3 = 93
Vì 9 > 6 nên 93 > 63 hay 36 > 63