Trả lời: a) $(\frac{-1}{3})^{4}=\frac{1}{81};(\frac{-2}{3})^{3}=\frac{-8}{27};(2\frac{1}{2})^{3}=(\frac{5}{2})^{3}=\frac{125}{8};(-0.2)^{3}=-\frac{1}{125};(-125.9)^{0}=1;(0.3)^{4}=\frac{81}{10000}$b) $(\frac{-1}{2})^{2}=\frac{1}{4};(\frac{-1}{2})^{3}=\frac{-1}{8};(\frac{-1}{2})^{4}=\frac{1}{16};(\frac{-1}{2...
Trả lời: a) $(-\frac{2}{3})^{3}\times (-\frac{2}{3})^{2}= (-\frac{2}{3})^{5}=\frac{-32}{243}$b) $(0.15)^{7}/(0.15)^{5}= (0.15)^{2}=0.0225$c) $(\frac{3}{5})^{15}/(\frac{27}{125})^{5}= (\frac{3}{5})^{15}/(\frac{3}{5})^{15}=1$d) $(\frac{1}{7})^{4}\times \frac{1}{7}\times 49^{3}=(\frac{1}{7})^{4...
Trả lời: a) $x/(\frac{-1}{3})^{3}=\frac{-1}{3}$ suy ra $x=(\frac{-1}{3})^{4}=\frac{1}{81}$b) $x\times (\frac{-3}{7})^{5}=(\frac{-3}{7})^{7}$ suy ra $x=(\frac{-3}{7})^{2}=\frac{9}{49}$c) $(\frac{-2}{3})^{12}/x=(\frac{-2}{3})^{9}$ suy ra $x=(\frac{-2}{3})^{12}/(\frac{-2}{3})^{9}=(\frac{-2}{3})^{3}$ nên $...
Trả lời: a)$ [(\frac{2}{5})^{6}\times (\frac{2}{5})^{5}]/(\frac{2}{5})^{9}=[(\frac{2}{5})^{11}]/(\frac{2}{5})^{9}=(\frac{2}{5})^{2}=\frac{4}{25}$b) $[(\frac{3}{7})^{8}/(\frac{3}{7})^{7}]\times (\frac{3}{7})=\frac{3}{7}\times\frac{3}{7}=\frac{9}{49}$c) $[(\frac{2}{5})^{9}\times (\frac{2}{5})^{...
Trả lời: a) $ (\frac{2}{5}-\frac{1}{3})^{2}=(\frac{1}{15})^{2}=\frac{1}{225}$b) $(1\frac{1}{2}-1.25)^{3}=(\frac{1}{4})^{3}=\frac{1}{64}$c) $(\frac{1}{2}+\frac{1}{3})^{2}/(1\frac{1}{2})^{2}=(\frac{5}{6})^{2}/(\frac{3}{2})^{2}=\frac{25}{36}/\frac{9}{4}=\frac{25}{81}$d) $2/(\frac{1}{2}-\frac{2}{3})^{3}=2/(\...
Trả lời: a) $\frac{9^{3}\times 2^{10}}{16^{2}\times 81^{2}}=\frac{3^{6}\times 2^{10}}{2^{8}\times 3^{8}}=\frac{2^{2}}{3^{2}}=\frac{4}{9}$b) $\frac{(-3)^{7}\times (-3)^{8}}{7 \times 9^{7}}=\frac{(-3)^{15}}{7 \times 9^{7}}=\frac{-3^{15}}{7 \times 3^{14}}=\frac{-3}{7}$c...
Trả lời: a) $5.9736\times 10^{24}<8.6810 \times 10^{25}<10.243\times 10^{25}<5.6846 \times 10^{26}<1.8986 \times 10^{27}$b) $1.8986 \times 10^{27}=1898.6 \times 10^{24}>5.9736 \times 10^{24}$Vậy Sao Mộc nặng nhất, Trái Đất nhẹ nhất.