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Đặt \(A=\frac{9+\frac{9}{11}+\frac{18}{23}-\frac{27}{37}}{8+\frac{8}{11}+\frac{16}{23}-\frac{24}{37}}-\frac{2+\frac{16}{29}-\frac{24}{13}-\frac{32}{11}}{3+\frac{24}{29}-\frac{36}{13}-\frac{48}{11}}\)\(=\frac{9\left(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37}\right)}{8\left(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37}\right)}-\frac{2\left(1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\right)}{3\left(1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\right)}\)
\(=\frac{9}{8}-\frac{2}{3}\)(do \(1+\frac{1}{11}+\frac{2}{23}-\frac{3}{37};1+\frac{8}{29}-\frac{12}{13}-\frac{16}{11}\ne0\))
\(=\frac{27}{24}-\frac{16}{24}=\frac{11}{24}.\)
Vậy A = \(\frac{11}{24}.\)
\(\frac{X}{126}=\frac{-7}{24}.\frac{-6}{11}\)
\(\frac{X}{126}=\frac{42}{264}\)
\(\frac{X}{126}=\frac{7}{44}\)
\(X=\frac{7}{44}.126=\frac{882}{44}=\frac{441}{22}\)
Vậy x = 441/22
\(\frac{x}{126}=\frac{-7}{24}.\frac{-6}{11}\)
\(\Rightarrow\frac{x}{126}=\frac{7}{44}\)
\(\Rightarrow x.44=126.7\)
\(\Rightarrow x.44=882\)
\(\Rightarrow x=882:44\)
\(\Rightarrow x=\frac{441}{22}\)
a)\(X-\frac{1}{4}\)=\(\frac{-3}{8}\)x\(\frac{2}{5}\)
\(X-\frac{1}{4}=\frac{-6}{40}\)
\(X\)=\(\frac{-6}{40}\)+\(\frac{1}{4}\)
\(X\)=\(\frac{-6}{40}+\frac{10}{40}\)
\(X\)=\(\frac{4}{40}\)=\(\frac{1}{4}\)
\(M=\frac{20}{8.14}+\frac{20}{14.20}+\frac{20}{20.26}+\frac{20}{26.32}\)
\(M=\frac{20}{6}\left(\frac{6}{8.14}+\frac{6}{14.20}+\frac{6}{20.26}+\frac{6}{26.32}\right)\)
\(M=\frac{20}{6}\left(\frac{1}{8}-\frac{1}{14}+\frac{1}{14}-\frac{1}{20}+\frac{1}{20}-\frac{1}{26}+\frac{1}{26}-\frac{1}{32}\right)\)
\(M=\frac{20}{6}\left(\frac{1}{8}-\frac{1}{32}\right)\)
\(M=\frac{20}{6}.\frac{3}{32}\)
\(M=\frac{5}{16}\)
k nha
\(M=\frac{5}{28}+\frac{5}{70}+\frac{5}{130}+\frac{5}{208}\)
\(M=\frac{5}{3}\cdot\left(\frac{3}{4\cdot7}+\frac{3}{7\cdot10}+\frac{3}{10\cdot13}+\frac{3}{13\cdot16}\right)\)
\(M=\frac{5}{3}\cdot\left(\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}...\frac{1}{13}-\frac{1}{16}\right)\)
\(M=\frac{5}{3}\cdot\left(\frac{1}{4}-\frac{1}{16}\right)\)
\(M=\frac{5}{3}\cdot\frac{3}{16}\)
\(M=\frac{5}{16}\)
1)
a)
\(\frac{-5}{6}.\frac{120}{25}< x< \frac{-7}{15}.\frac{9}{14}\)
\(\frac{-1}{1}.\frac{20}{5}< x< \frac{-1}{5}.\frac{3}{2}\)
\(\frac{-20}{5}< x< \frac{-3}{10}\)
\(\frac{-40}{10}< x< \frac{-3}{10}\)
\(\Rightarrow Z\in\left\{-4;-5;-6;-7;-8;-9;-10;...;-39\right\}\)
dễ mà ko chịu làm đi
rút gọn vế phải rùi nhân vs 126 là xong rùi còn j
Bạn bấm máy tính đi