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\(C=\frac{4}{20}+\frac{9}{20}+\frac{16}{20}+\frac{25}{50}+\frac{36}{60}\)
\(C=\left(\frac{4}{20}+\frac{16}{20}\right)+\left(\frac{9}{20}+\frac{25}{50}+\frac{36}{60}\right)\)
\(C=1+\frac{31}{20}\)
\(C=\frac{51}{20}\)
\(M=\frac{1}{10}+\frac{4}{20}+\frac{9}{30}+\frac{16}{40}+...+\frac{81}{90}\)
\(M=\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}+...+\frac{9}{10}\)
\(M=\frac{\left(9+1\right)\cdot\left(9-1+1\right):2}{10}\)
\(M=\frac{10\cdot9:2}{10}=4,5\)
=2/10+3/10+4/10+......+13/10
=\(\frac{2+3+4+......+13}{10}\)
=90/10=9
k cho mình nha
\(\frac{1}{5}+\frac{4}{10}+\frac{9}{15}+\frac{16}{20}+\frac{36}{30}+\frac{64}{40}+\frac{81}{45}\)
\(=\frac{33}{5}\)
A= \((2^3\times2^{36}\times3^{20}+2^{19}\times2^{20}\times3^{20})\div(2^{20}\times5^{40}\div5^{40})\)
\(\Rightarrow A=(2^{39}\times3^{20}+2^{39}\times3^{20})\div2^{20}\)
\(\Rightarrow A=2^{39}\times3^{20}(1+1)\div2^{20}\)
\(\Rightarrow A=2^{40}\times3^{20}\div2^{20}\)
\(\Rightarrow A=2^{20}\times3^{20}=6^{20}\)
Vậy: \(A=6^{20}\)
\(B=\frac{3+\frac{8}{12}+\frac{9}{13}-\frac{12}{17}}{4+\frac{8}{12}+\frac{12}{13}-\frac{16}{17}}+\frac{4+\frac{16}{60}-\frac{24}{213}-\frac{32}{11}}{5+\frac{20}{61}-\frac{36}{213}-\frac{40}{11}}\)
\(\Leftrightarrow B=\frac{3\left(1+\frac{8}{12}+\frac{3}{13}-\frac{4}{17}\right)}{4\left(1+\frac{8}{12}+\frac{3}{13}-\frac{4}{17}\right)}+\frac{4\left(1+\frac{4}{60}-\frac{6}{213}-\frac{8}{11}\right)}{5\left(1+\frac{4}{60}+\frac{6}{213}-\frac{8}{11}\right)}\)
\(\Leftrightarrow B=\frac{3}{4}+\frac{4}{5}\)
\(\Leftrightarrow B=\frac{15}{20}+\frac{16}{20}\)
\(\Leftrightarrow B=\frac{31}{20}\)
43/20
k đi mk k lại