Đáp án + Giải thích các bước giải:
`a,\frac{10^{2}.9-10^{2}.2}{700}`
`=\frac{10^{2}.(9-2)}{100.7}`
`=\frac{10^{2}.7}{10^{2}.7}`
`=1`
`----------`
`b,\frac{3^{9}.3^{20}.2^{8}}{3^{24}.243.2^{6}}`
`=\frac{3^{9}.3^{20}.2^{8}}{3^{24}.3^{5}.2^{6}}`
`=\frac{3^{29}.2^{8}}{3^{29}.2^{6}}`
`=\frac{3^{29}.2^{6}.2^{2}}{3^{29}.2^{6}}`
`=2^2`
`=4`
`---------`
`c,\frac{2^{15}.5^{3}.2^{6}.3^{4}}{8.2^{18}.81.5}`
`=\frac{2^{15}.5^{3}.2^{6}.3^{4}}{2^{3}.2^{18}.3^{4}.5}`
`=\frac{2^{21}.5^{3}.3^{4}}{2^{21}.3^{4}.5}`
`=\frac{2^{21}.3^{4}.5.5^{2}}{2^{21}.3^{4}.5}`
`=5^2`
`=25`
