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27 tháng 3 2024

\(\left(\dfrac{5}{7}-\dfrac{7}{7}\right)-\left[0,2-\left(-\dfrac{2}{7}-\dfrac{1}{10}\right)\right]\)

=\(-\dfrac{2}{7}-\left[\dfrac{1}{5}+\dfrac{2}{7}+\dfrac{1}{10}\right]\)  

=\(-\dfrac{2}{7}-\dfrac{1}{5}-\dfrac{2}{7}-\dfrac{1}{10}\) 

=\(\left(-\dfrac{2}{7}-\dfrac{2}{7}\right)-\left(\dfrac{1}{5}+\dfrac{1}{10}\right)\) 

=\(-\dfrac{4}{7}-\left(\dfrac{2}{10}+\dfrac{1}{10}\right)\) 

=\(-\dfrac{4}{7}-\dfrac{3}{10}\) 

=\(-\dfrac{40}{70}-\dfrac{21}{70}\)

=\(-\dfrac{61}{70}\)

 

 

27 tháng 3 2024

   (3 - \(\dfrac{1}{4}\) + \(\dfrac{2}{3}\)) - (5 - \(\dfrac{1}{3}\) - \(\dfrac{5}{6}\)) - (6 - \(\dfrac{7}{4}\) - \(\dfrac{3}{2}\))

= 3 - \(\dfrac{1}{4}\) + \(\dfrac{2}{3}\) - 5 + \(\dfrac{1}{3}\) + \(\dfrac{5}{6}\) - 6 + \(\dfrac{7}{4}\) + \(\dfrac{3}{2}\)

= (3 - 5 - 6) + ( \(\dfrac{7}{4}\) - \(\dfrac{1}{4}\)) + (\(\dfrac{2}{3}\) + \(\dfrac{1}{3}\)) +  \(\dfrac{3}{2}\) + \(\dfrac{5}{6}\)

= - 8  + \(\dfrac{3}{2}\) + 1 + \(\dfrac{3}{2}\) + \(\dfrac{5}{6}\)

= (- 8 + 1) + (\(\dfrac{3}{2}\) + \(\dfrac{3}{2}\)) + \(\dfrac{5}{6}\)

= -7 + 3 + \(\dfrac{5}{6}\)

= - 4 + \(\dfrac{5}{6}\)

\(\dfrac{-19}{6}\)

8 tháng 12 2015

**** mk đi hồi chừ chưa có ai **** hết

11 tháng 6 2024

a; \(\dfrac{3}{11}\) + \(\dfrac{5}{-9}\) + \(\dfrac{4}{11}\) - \(\dfrac{4}{9}\) + \(\dfrac{3}{17}\) + \(\dfrac{15}{11}\)

= (\(\dfrac{3}{11}\) + \(\dfrac{4}{11}\) + \(\dfrac{15}{11}\)) - (\(\dfrac{5}{9}\) + \(\dfrac{4}{9}\)) + \(\dfrac{3}{17}\)

= 2 - 1 + \(\dfrac{3}{17}\)

= 1 + \(\dfrac{3}{17}\)

\(\dfrac{20}{17}\) 

11 tháng 6 2024

c; N = \(\dfrac{\dfrac{5}{7}-\dfrac{5}{9}-\dfrac{5}{11}}{\dfrac{15}{7}+\dfrac{15}{9}+\dfrac{15}{11}}\)

   Phải là - \(\dfrac{5}{7}\) chỗ tử số mới đúng em nhé!

14 tháng 7 2019

a) \(\frac{-3}{16}+\frac{-7}{16}+\frac{6}{-16}\)

\(=-\frac{3}{16}+-\frac{7}{16}+\frac{-6}{16}\)

\(=\frac{\left(-3\right)+\left(-7\right)+\left(-6\right)}{16}\)

\(=\frac{-16}{16}=-1\)

b) \(\frac{2}{5}-\frac{1}{7}+\frac{7}{10}\)

\(=\frac{28}{70}-\frac{10}{70}+\frac{49}{70}\)

\(=\frac{28-10+49}{70}\)

\(=\frac{67}{70}\)

c) \(3+\frac{1}{3}-2\frac{1}{2}\)

\(=\frac{3}{1}+\frac{1}{3}-\frac{5}{2}\)

\(=\frac{18}{6}+\frac{2}{6}-\frac{15}{6}\)

\(=\frac{18+2-15}{6}\)

\(=\frac{5}{6}\)

d) \(-\frac{3}{5}-\left(-\frac{2}{15}\right)\)

\(=-\frac{3}{5}+\frac{2}{15}\)

\(=\frac{-9}{15}+\frac{2}{15}\)

\(=-\frac{7}{15}\)

14 tháng 7 2019

\(\frac{-3}{16}\)+(\(\frac{-7}{16}\) ) +(\(\frac{6}{-16}\))

=\(\frac{-3-7-6}{16}\)

=\(\frac{-16}{16}\)\(-1\)

\(\frac{2}{5}\)\(-\)\(\frac{1}{7}\)+\(\frac{7}{10}\)

=\(\frac{9}{35}\)+\(\frac{7}{10}\)

=\(\frac{67}{70}\)

3+ \(\frac{1}{3}\)\(-\) \(\frac{21}{2}\)

=\(\frac{18+2-63}{6}\)

=\(\frac{-43}{6}\)

\(\frac{-3}{5}\)\(-\)(\(\frac{-2}{15}\))

=\(\frac{-3}{5}\)+\(\frac{2}{15}\)

=\(\frac{-9+2}{15}\)

=\(\frac{-7}{15}\)

11 tháng 8 2018

a) \(\left(2x-1\right)+\frac{3}{15}=\frac{3}{2}\)

\(\Rightarrow2x-1=\frac{3}{2}-\frac{3}{15}=\frac{13}{10}\)

\(\Rightarrow2x=\frac{13}{10}+1=\frac{23}{10}\)

\(\Rightarrow x=\frac{23}{20}\)

b) \(x+\frac{46}{15}=1,5\)

\(\Rightarrow x+\frac{46}{15}=\frac{3}{2}\)

\(\Rightarrow x=\frac{3}{2}-\frac{46}{15}\)

\(\Rightarrow x=\frac{-47}{30}\)

c) \(\left(-2x+1\right)+\frac{3}{15}=\frac{5}{3}\)

\(\Rightarrow-2x+1=\frac{5}{3}-\frac{3}{15}=\frac{22}{15}\)

\(\Rightarrow-2x=\frac{7}{15}\Rightarrow x=\frac{-7}{30}\)

9 tháng 3 2019

A= 3/10

B= 1/20

C= 73/84