Tính GT biểu thức:( tính nhanh )\(C=\frac{2^{15}\times9^4}{6^6\times8^3}\)
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\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+...+\frac{1}{8.9.10}=\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{2.3}\right)+\frac{1}{2}.\left(\frac{1}{2.3}-\frac{1}{3.4}\right)+...+\frac{1}{2}.\left(\frac{1}{8.9}-\frac{1}{9.10}\right)\)
\(=\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{2.3}+\frac{1}{2.3}-\frac{1}{3.4}+...+\frac{1}{8.9}-\frac{1}{9.10}\right)\)
\(\frac{1}{2}.\left(\frac{1}{1.2}-\frac{1}{9.10}\right)=\frac{1}{2}.\frac{22}{45}=\frac{11}{45}\)
\(\frac{2^5.9^4}{6^6.8^3}=\frac{2^5.3^8}{2^6.3^6.2^9}=\frac{3^2}{2.2^9}=\frac{9}{2^{10}}=\frac{9}{1024}\)
Hok tốt
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\(\frac{2^{15}.9^4}{6^6.8^3}=\frac{2^{15}.\left(3^2\right)^4}{\left(2.3\right)^6.\left(2^3\right)^3}=\frac{2^{15}.3^8}{2^6.3^6.2^9}=\frac{2^{15}.3^8}{2^{15}.3^6}=\frac{3^8}{3^6}=3^2=9\)
a) \(\frac{2^{11}.9^2}{3^5.16^2}=\frac{2^{11}.3^4}{3^5.2^8}=\frac{2^3}{3}=\frac{8}{3}\)
\(\frac{2^7\cdot9^3}{6^5\cdot8^2}\)
\(=\frac{2^7\cdot3^6}{3^5\cdot2^5\cdot2^6}\)
\(=\frac{3}{16}\)
\(\frac{2^{15}.9^4}{6^6.8^3}=\frac{2^9.2^6.\left(3^2\right)^4}{\left(2.3\right)^6.\left(2^3\right)^3}=\frac{2^9.2^6.3^8}{2^9.2^6.3^6}=\frac{2^9.2^6.3^6.3^2}{2^9.2^6.3^6}=3^2=9\)