a) 2^3.3^3.5^3.7.8/ 3.2^4.5^3.14= 2^6 . 3^3 . 5^3 . 7/ 3. 2^5. 7. 5^3
rút gọn sau đó ra kết quả: 2. 3^2=18
b) 9. 520. 279- 3.915.259/ 7.329. 1256- 3.39. 1519= 32. 520- 3.330.518/7.329.518- 310.319.519
=32. 520-331.518/ 7.329.518 - 329.519= 32. 518 ( 25-329) / 329. 518.2
tiếp theo em tu giai nhe
`Answer:`
a. \(\frac{2^3.3^3.5^3.7.8}{3.2^4.5^3.14}\)
\(=\frac{3^2.7.2.2.2}{2.7.2}\)
\(=\frac{3^2.2}{1}\)
\(=18\)
b. \(\frac{9.5^{20}.27^9-3.9^{15}.25^9}{7.3^{29}.125^6-3.3^9.15^{19}}\)
Ta xét tử số: \(9.5^{20}.27^9-3.9^{15}.25^9\)
\(=3^2.5^{20}.\left(3^3\right)^9-3.\left(3^2\right)^{15}.\left(5^2\right)^9\)
\(=3^2.5^{20}.3^{27}-3.3^{30}.5^{18}\)
\(=5^{20}.3^{29}-3^{31}.5^{18}\)
\(=3^{29}.5^{18}.\left(5^2-3^2\right)\)
\(=3^{29}.5^{18}.16\)
Ta xét mẫu số: \(7.3^{29}.125^6-3.3^9.15^{19}\)
\(=7.3^{29}.\left(5^3\right)^6-3^{10}.\left(3.5\right)^{19}\)
\(=7.3^{29}.5^{18}-3^{10}.3^{19}.5^{19}\)
\(=7.3^{29}.5^{18}-3^{29}.5^{19}\)
\(=3^{29}.5^{18}.\left(7-5\right)\)
\(=3^{29}.5^{18}.2\)
`=>` Phân số trở thành: \(\frac{3^{29}.5^{18}.16}{3^{29}.5^{18}.2}\)\(=\frac{16}{2}=8\)