\(\frac{3}{8}.x+\frac{11}{4}=-0,25\)
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3 tháng 3 2020
a,\(\frac{1}{4}.13\frac{9}{11}+0,25.6\frac{2}{11}\)
\(=0,25.\left(13\frac{9}{11}+6\frac{2}{11}\right)\)
\(=0,25.20\)
\(=5\)
b,\(\frac{7}{8}-2\frac{5}{6}+1,25\)
\(=\frac{7}{8}-\frac{17}{6}+\frac{5}{4}\)
\(=\frac{42}{48}-\frac{136}{48}+\frac{60}{48}\)
\(=\frac{42-136+60}{48}=-\frac{34}{48}=-\frac{17}{24}\)
3 tháng 3 2020
a) =0,25.152/11+0,25.68/11
=0,25.( 152/11+68/11)
=0,25.20
=5
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15 tháng 8 2016
a) \(\frac{-3}{5}.y=\frac{21}{10}\)
\(y=\frac{21}{10}:\frac{-3}{5}\)
\(y=\frac{-7}{2}\)
vậy \(y=\frac{-7}{2}\)
b) \(y:\frac{3}{8}=-1\frac{31}{33}\)
\(y:\frac{3}{8}=\frac{-64}{33}\)
\(y=\frac{-64}{33}.\frac{3}{8}\)
\(y=\frac{-8}{11}\)
vậy \(y=\frac{-8}{11}\)
c) \(1\frac{2}{5}.y+\frac{3}{7}=\frac{-4}{5}\)
\(\frac{7}{5}.y+\frac{3}{7}=\frac{-4}{5}\)
\(\frac{7}{5}.y=\frac{-4}{5}-\frac{3}{7}\)
\(\frac{7}{5}.y=\frac{-43}{35}\)
15 tháng 8 2016
\(y=\frac{-43}{35}:\frac{7}{5}\)
\(y=\frac{-43}{49}\)
vậy \(y=\frac{-43}{49}\)
d) \(\frac{-11}{12}.y+0,25=\frac{5}{6}\)
\(\frac{-11}{12}.y=\frac{5}{6}-0,25\)
\(\frac{-11}{12}.y=\frac{7}{12}\)
\(y=\frac{7}{12}:\frac{-11}{12}\)
\(y=\frac{-7}{11}\)
vậy \(y=\frac{-7}{11}\)
25 tháng 1 2017
Ta có: \(A=\frac{\frac{3}{11}+1-\frac{3}{7}}{3+\frac{9}{11}-\frac{9}{7}}-\frac{\frac{1}{3}+0,25-\frac{1}{5}+0,125}{\frac{7}{6}+\frac{7}{8}-0,7+\frac{7}{16}}\)
\(=\frac{3\left(\frac{1}{11}+\frac{1}{3}-\frac{1}{7}\right)}{9\left(\frac{1}{3}+\frac{1}{11}-\frac{1}{7}\right)}-\frac{2\left(\frac{1}{6}+\frac{1}{8}-\frac{1}{10}+\frac{1}{16}\right)}{7\left(\frac{1}{6}+\frac{1}{8}-\frac{1}{10}+\frac{1}{16}\right)}\)
\(=\frac{3}{9}-\frac{2}{7}=\frac{1}{3}-\frac{2}{7}=\frac{7}{21}-\frac{6}{21}=\frac{1}{21}\)
Vậy \(A=\frac{1}{21}\)
\(\frac{3}{8}x+\frac{11}{4}=-0,25\)
\(\frac{3}{8}x+\frac{11}{4}=\frac{-1}{4}\)
\(\frac{3}{8}x=\frac{-1}{4}-\frac{11}{4}\)
\(\frac{3}{8}x=-3\)
\(x=\left(-3\right):\frac{3}{8}\)
\(x=-8\)
~ Hok tốt ~
\(\frac{3}{8}x+\frac{11}{4}=-0,25\)
\(\Rightarrow\frac{3}{8}x+\frac{11}{4}=\frac{-1}{4}\)
\(\Rightarrow\frac{3}{8}x=\frac{-12}{4}\)
\(\Rightarrow\frac{3}{8}x=\frac{-24}{8}\)
\(\Rightarrow3x=-24\)
\(\Rightarrow x=-8\)