Question

Tính nợp lí nếu có thể :

1) \(\left(1-\frac{1}{3}\right):\frac{4}{21}+\left|\frac{-5}{8}\right|\)

2) \(\left(\frac{1}{27}\right)^{2016}\times27^{2015}\)

3) \(\frac{4^{15}.2^{19}}{16^{12}}\)

Answer 1

1)\(=\left(1-\frac{1}{3}\right):\frac{4}{21}+\frac{5}{8}\)

=\(\left(\frac{3}{3}-\frac{1}{3}\right):\frac{4}{21}+\frac{5}{8}\)

=\(\frac{2}{3}:\frac{4}{21}+\frac{5}{8}\)

=\(\frac{2}{3}\cdot\frac{21}{4}+\frac{5}{8}\)

=\(\frac{7}{2}+\frac{5}{8}\)

=\(\frac{28}{8}+\frac{5}{8}=\frac{33}{8}\)

Answer 2

3)\(\frac{4^{15}.2^{19}}{16^{12}}\)

=\(\frac{2^{30}.2^{19}}{2^{48}}\)

=\(\frac{2^{49}}{2^{48}}\)

=2