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3)\(\frac{4^{15}.2^{19}}{16^{12}}\)
=\(\frac{2^{30}.2^{19}}{2^{48}}\)
=\(\frac{2^{49}}{2^{48}}\)
=2
1)\(=\left(1-\frac{1}{3}\right):\frac{4}{21}+\frac{5}{8}\)
=\(\left(\frac{3}{3}-\frac{1}{3}\right):\frac{4}{21}+\frac{5}{8}\)
=\(\frac{2}{3}:\frac{4}{21}+\frac{5}{8}\)
=\(\frac{2}{3}\cdot\frac{21}{4}+\frac{5}{8}\)
=\(\frac{7}{2}+\frac{5}{8}\)
=\(\frac{28}{8}+\frac{5}{8}=\frac{33}{8}\)
\(\frac{2}{3}+\left(\frac{5}{14}+\frac{-25}{23}\right)-\left(\frac{-2}{23}-\frac{9}{14}\right)\) \(=\frac{2}{3}+\frac{5}{14}+\frac{-25}{23}+\frac{2}{23}+\frac{9}{14}\) \(=\frac{2}{3}+\left(\frac{5}{14}+\frac{9}{14}\right)+\left(\frac{-25}{23}+\frac{2}{23}\right)\) \(=\frac{2}{3}+1-1\) =\(\frac{2}{3}\)
5/2x + x = 32/15
(5/2 -1)x = 32/15
3/2x = 32/15
x = 32/15: 3/2
x = 32/15 . 2/3
x =64/45
Vay x = 64/45
cach 1 dung nhan hoa khien su vat goi cam va sinh dong
cach 2 khong dung nhan hoa
hay cach 1 dung trong bieu cam , cach 2 dung trong thuyet minh