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16 tháng 9 2018

\(\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right)-\left(5-\dfrac{1}{3}-\dfrac{6}{5}\right)-\left(6-\dfrac{7}{4}+\dfrac{3}{2}\right)\)

\(=\left(\dfrac{88-33+60}{132}\right)-\left(\dfrac{75-5-18}{15}\right)-\left(\dfrac{24-7+6}{4}\right)\)

\(=\dfrac{115}{132}-\dfrac{52}{15}-\dfrac{23}{4}\)

\(=-8\dfrac{19}{55}\)

10 tháng 8 2016

a)\(3-\left(\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)

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

=\(\left(3-5-6\right)+\left(\frac{-1}{4}+\frac{7}{4}\right)+\left(\frac{-2}{3}-\frac{1}{3}\right)+\left(\frac{6}{5}-\frac{3}{2}\right)\)

=\(-8+\frac{3}{2}-1-\frac{3}{10}\)

=\(\left(-8-1\right)+\left(\frac{3}{2}-\frac{3}{10}\right)\)

=-9+\(\frac{6}{5}\)

=\(\frac{-39}{5}\)

21 tháng 8 2016

(7 - 3/4 + 1/3) - (6 + 5/4 - 4/3) - (5 - 7/4 + 5/3)

= 7 - 3/4 + 1/3 - 6 - 5/4 + 4/3 - 5 + 7/4 - 5/3

= (7 - 6 - 5) - (3/4 + 5/4 - 7/4) + (1/3 + 4/3 - 5/3)

= -4 - 1/4 + 0

= -16/4 - 1/4

= -17/4

9 tháng 7 2018

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

\(\frac{1}{2}-\frac{2}{3}-0-0-0-\frac{6}{7}\)

\(\frac{1}{2}-\frac{2}{3}-\frac{6}{7}\)

=\(\frac{21}{42}-\frac{28}{42}-\frac{36}{42}\)

\(\frac{-43}{42}\)

9 tháng 7 2018

hjjjjhhbnjbbhhbbb

1: =1/8*9/4=9/32

2: =8/27*243/32=9/4

3: =(5/4*4/5)^5*(4/5)^2=16/25

4: \(=\left(-\dfrac{5}{6}\cdot\dfrac{6}{5}\right)^2\cdot\left(\dfrac{6}{5}\right)^2=\dfrac{36}{25}\)

5: \(=\left(-\dfrac{4}{3}\right)^3\cdot\left(\dfrac{3}{4}\right)^{10}=\left(-1\right)\left(\dfrac{3}{4}\right)^7=-\left(\dfrac{3}{4}\right)^7\)

6: \(=\left(\dfrac{1}{3}\cdot\dfrac{-9}{2}\right)^4\left(-\dfrac{9}{2}\right)^2=\left(-\dfrac{3}{2}\right)^4\cdot\dfrac{81}{4}=\dfrac{9}{4}\cdot\dfrac{81}{4}=\dfrac{729}{16}\)

8: =(0,2*5)^4*5^2=25

10: =-0,5^5*2^10

=-0,5^5*2^5*2^5

=-32

13: =(0,5*2)^2*2^2=4

 

6 tháng 7 2023

mình cảm ơn ạ

30 tháng 8 2018

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

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

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

= \(\left(-8\right)+2+1+\dfrac{-3}{10}\)

= \(\left(-5\right)+\dfrac{-3}{10}\)

= \(\dfrac{-53}{10}\) = \(-5,3\)

20 tháng 8 2018

khó quá mk giải miết mà không ra

21 tháng 8 2018

khó vãi