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4. 用简便方法计算下列各题.
(1)$(-9)^{3}×(-\frac {2}{3})^{3}×(\frac {1}{3})^{3};$
(2)$8^{2023}×(-0.125)^{2024};$
(3)$3^{18}×(-\frac {1}{9})^{8}.$
(1)$(-9)^{3}×(-\frac {2}{3})^{3}×(\frac {1}{3})^{3};$
(2)$8^{2023}×(-0.125)^{2024};$
(3)$3^{18}×(-\frac {1}{9})^{8}.$
答案
4. (1)8 (2)0.125 (3)9
5. 已知$a^{x}=4,b^{x}=5$.求$(ab)^{2x}$的值.
答案
5. 400
