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\(\frac{45^{10}.5^{20}}{75^{15}}=\frac{15^{10}.3^{10}.5^{10}.5^{10}}{75^{15}}=\frac{75^{10}.15^{10}}{75^{15}}=\frac{15^{10}}{75^5}=\frac{15^{10}}{15^5.5^5}=\frac{15^5}{5^5}=\left(\frac{15}{5}\right)^5=3^5=243.\)
a/ 4510 . 520 / 7515 = (32.5)10.520/ (3.52)15 = 320.530/ 315.530 = 35=243
b/ 215. 94 / 66. 83 = 215.38/ 26.36.29 = 32 = 9
a)\(\frac{45^{10}.5^{20}}{75^{15}}=\frac{\left(3^2.5\right)^{10}.5^{20}}{3^{15}.\left(5^2\right)^{15}}=\frac{3^{20}.5^{30}}{3^{15}.5^{30}}=3^5=243\)
b) \(\frac{2^{15}\left(3^2\right)^4}{\left(2.3\right)^6.\left(2^3\right)^3}=\frac{2^{15}.3^8}{2^{15}.3^6}=3^2=9\)
a/ \(\frac{45^{10}.5^{20}}{75^{15}}=\frac{\left(3^2\right)^{10}.5^{10}.5^{20}}{3^{15}.\left(5^2\right)^{15}}=\frac{3^{20}.5^{30}}{3^{15}.5^{30}}=3^5.\)
b/ \(\frac{2^{15}.9^4}{6^6.8^3}=\frac{2^{15}.\left(3^2\right)^4}{2^6.3^6.\left(2^3\right)^3}=\frac{2^{15}.3^8}{2^{15}.3^6}=3^2\)
Chứng minh:
a/ \(12^8.9^{12}=\left(2^2\right)^8.3^8.9^{12}=2^{16}.\left(3^2\right)^4.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^{16}\)
b/ \(75^{20}=\left(3.25\right)^{20}=3^{20}.\left(5^2\right)^{20}=3^{20}.5^{40}=\left(3^2\right)^{10}.5^{10}.5^{30}=\left(9.5\right)^{10}.5^{30}=45^{10}.5^{30}\)
\(=\frac{45^{10}\cdot5^{15}\cdot5^5}{15^{15}\cdot5^{15}}=\frac{45^{10}\cdot5^5}{15^5}=\frac{15^{10}\cdot3^{10}\cdot5^5}{15^5}=\frac{15^5\cdot15^5\cdot3^{10}\cdot5^5}{15^5}\)\(=15^5\cdot3^{10}\cdot5^5=15^5\cdot3^5\cdot3^5\cdot5^5=\left(15\cdot3\cdot3\cdot5\right)^5=675^5\)
a, (1/5)5x(3)5
=1/3125.243
=243/3125
b, (0,125)^3.512
=1/512.512
=1
c,(0,25)^4.1024
=1/256.1024
=4
2,hầu như chịu hết
hi thảo
cậu đánh lại câu hỏi đi