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a) \(\frac{75^3.3^7}{81^4.5^6}=\frac{5^3.3^3.5^3.3^7}{\left(3^4\right)^4.5^6}=\frac{5^6.3^3.3^7}{3^{16}.5^6}=\frac{3^{10}}{3^{16}}=\frac{1}{3^6}=\frac{1}{729}\)
b) \(\frac{6^6.4^2}{3^{12}.2^8}=\frac{2^6.3^6.\left(2^2\right)^2}{3^{12}.2^8}=\frac{2^6.3^6.2^4}{3^{12}.2^8}=\frac{2^{10}.3^6}{3^{12}.2^8}=\frac{2^2.1}{3^6}=\frac{4}{729}\)
c) \(\frac{34^5.2^5}{2^{14}.17^5}=\frac{2^5.17^5.2^5}{2^{14}.17^5}=\frac{2^{10}}{2^{14}}=\frac{1}{2^4}=\frac{1}{16}\)
a) \(\frac{7^3.5^8}{49.25^4}=\frac{7^3.5^8}{7^2.\left(5^2\right)^4}=7.\frac{5^8}{5^8}=7\)
b) \(\frac{3^9.25.5^3}{15.625.3^8}=\frac{3.3^8.5^2.5^3}{3.5.5^4.3^8}=\frac{5^5}{5^5}=1\)
c) Đề hơi sai roi bạn oi
d) \(\left(\frac{2}{5}-\frac{1}{2}\right)^2+\left(\frac{1}{2}+\frac{3}{5}\right)^2=\left(\frac{-1}{10}\right)^2+\left(\frac{11}{10}\right)^2=\frac{1}{100}+\frac{121}{100}=\frac{61}{50}\)
[Giải:]
= 31955 . 359 . (23)19 / ( 2 . 3)60 . 31955
= 359 . 257 / 260 . 360
= 359 . 257 / 257 . 23 . 359 . 3
= 1/23 . 3
= 1/24
[ Hoq chắc - Thắc mắc -> ib hỏi ]
\(\dfrac{27^4\cdot\left(-8\right)^2}{9^5\cdot6^3}=\dfrac{\left(3^3\right)^4\cdot\left(2^3\right)^2}{\left(3^2\right)^5\cdot\left(2\cdot3\right)^3}=\dfrac{3^{12}\cdot2^6}{3^{10}\cdot2^3\cdot3^3}=\dfrac{2^3}{3}=\dfrac{8}{3}\)
\(\dfrac{24^4.\left(-8\right)^2}{9^5.6^3}\)
=\(\dfrac{\left(4.6\right)^4.\left(2^3\right)^2}{\left(3^2\right)^5.6^3}\)
=\(\dfrac{4^4.6^4.2^6}{3^{10}.6^3}\)
=\(\dfrac{2^{14}.6}{3^{10}}\)
lẹ giúp mk nhé
\(Tacó\frac{8^{19}\times14^{11}}{49^6\times2^{68}}\)
\(=\frac{\left(2^3\right)^{19}\times2^{11}\times7^{11}}{\left(7^2\right)^6\times2^{68}}\)
\(=\frac{2^{57}\times2^{11}\times7^{11}}{7^{12}\times2^{68}}\)
\(=\frac{2^{68}\times7^{11}}{7^{12}\times2^{68}}\)
\(=\frac{1\times1}{7\times1}\)
\(=\frac{1}{7}\)