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= 93/4 . 7/5 - 53/4 : 5/7
=93/4 . 7/5 - 53/4 . 7/5
= 7/5 .( 93/4 - 53/4 )
= 7/5 . 10 ( rút gọn chéo 7/5 . 10 = 7 .2 =14)
= 14
tích cho mình nha
\(6\frac{4}{5}:\frac{3}{7}+\frac{27}{5}:\sqrt{\frac{9}{49}}\)
\(=\frac{34}{5}:\frac{3}{7}+\frac{27}{5}:\frac{3}{7}\)
\(=\frac{34}{5}\cdot\frac{7}{3}+\frac{27}{5}\cdot\frac{7}{3}\)
\(=\frac{7}{3}\left(\frac{34}{5}+\frac{27}{5}\right)\)
\(=\frac{7}{3}\cdot12=28\)
C1: A= (36/6+4/6+3/6)-(30/6+10/6-9/6)-(18/6-14/6+15/6)
=43/6-31/6-19/6
=-7/6
C2: A = 6-2/3+1/2-5-5/3+3/2-3+7/3-5/2
=(6-5-3)+(2/3-5/3+7/3)+(1/2+3/2-5/2)
=-2+4/3+(-1/2)
=-12/6+8/6+(-3/6)
=-7/6
\(A=\frac{\frac{1}{3}-0,25+\frac{1}{5}}{\frac{7}{6}-0,875+0,7}\)
\(=\frac{\frac{1}{3}-\frac{1}{4}+\frac{1}{5}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
\(=\frac{2\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}{7\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}\)
\(=\frac{2}{7}\)
\(=\frac{-5}{70}.\left(1+\frac{1}{10}+\frac{1}{10^2}+\frac{1}{10^3}+\frac{1}{10^4}\right)\)
\(=\frac{-1}{14.9}\left(10-1+\frac{10-1}{10}+\frac{10-1}{10^2}+\frac{10-1}{10^3}+\frac{10-1}{10^4}\right)\)
\(=\frac{-1}{14.9}\left(10-\frac{1}{10^4}\right)\)=\(\frac{-11111}{14.10^4}\)