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14 tháng 3 2022

\(=\dfrac{4}{5}\left(\dfrac{-11}{13}+\dfrac{-3}{5}\right)-\dfrac{1}{5}\\ =\dfrac{4}{5}\cdot\dfrac{-94}{65}-\dfrac{1}{5}=\dfrac{-144}{325}\)

14 tháng 3 2022

\(=\dfrac{4}{5}.\left(\dfrac{-11}{13}+\dfrac{-2}{13}\right)-\dfrac{1}{5}\)

\(=\dfrac{4}{5}.\left(-1\right)-\dfrac{1}{5}\)

\(=\dfrac{-4}{5}-\dfrac{1}{5}\)

\(=-1\)

sai mog bạn thông cảm 

30 tháng 12 2021

a) (-124) + 24 = -100
b) 37. 78 + 37. 22
=  37 . ( 78 + 22 )
=  37 . 100
= 3700

 

30 tháng 12 2021

tk cho mik nha

b: \(\dfrac{3}{4}-\dfrac{7}{15}+\dfrac{1}{4}+\dfrac{1}{2022}-\dfrac{8}{15}\)

\(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)-\left(\dfrac{7}{15}+\dfrac{8}{15}\right)+\dfrac{1}{2022}\)

\(=1-1+\dfrac{1}{2022}=\dfrac{1}{2022}\)

c: \(\dfrac{3}{5}\cdot\dfrac{4}{7}+\dfrac{3}{7}\cdot\dfrac{9}{5}+\dfrac{13}{7}\cdot\dfrac{2}{5}\)

\(=\dfrac{3}{5}\cdot\dfrac{4}{7}+\dfrac{3}{5}\cdot\dfrac{9}{7}+\dfrac{13}{7}\cdot\dfrac{2}{5}\)

\(=\dfrac{3}{5}\left(\dfrac{4}{7}+\dfrac{9}{7}\right)+\dfrac{13}{7}\cdot\dfrac{2}{5}\)

\(=\dfrac{3}{5}\cdot\dfrac{13}{7}+\dfrac{13}{7}\cdot\dfrac{2}{5}\)

\(=\dfrac{13}{7}\left(\dfrac{3}{5}+\dfrac{2}{5}\right)=\dfrac{13}{7}\)

14 tháng 3 2022

= 3/7 + 15/26 - 2/13 + 3/7

=3/7 + (15/26 - 2/13)

=3/7 + 4/26

=.......


 

\(=\dfrac{2^{32}\cdot5^{16}\cdot5^9\cdot2^9\cdot5^6\cdot7^6}{2^{36}\cdot5^{28}\cdot2^5\cdot7^5}=\dfrac{2^{41}\cdot5^{31}\cdot7^6}{2^{41}\cdot5^{28}\cdot7^5}=5^3\cdot7=875\)

1 tháng 11 2021

\(=\dfrac{2^{32}\cdot5^{16}\cdot2^9\cdot5^9\cdot5^6\cdot7^6}{2^{36}\cdot5^{28}\cdot2^5\cdot7^5}=5^3\cdot7=875\)

\(A=-\dfrac{1}{6}-\left[\dfrac{9}{16}-\dfrac{9}{8}+\dfrac{3}{4}\right]\)

\(=\dfrac{-1}{6}-\dfrac{9-18+12}{16}=\dfrac{-1}{6}-\dfrac{3}{16}\)

\(=\dfrac{-8}{48}-\dfrac{9}{48}=-\dfrac{17}{48}\)

\(B=\left(-\dfrac{3}{4}+\dfrac{3}{4}\right)^2+\dfrac{3}{4}\cdot\dfrac{-5}{9}+7^3\)

=-15/36+343

=343-5/12=4111/12

\(=64\cdot\dfrac{-1}{8}+100\cdot\dfrac{1}{100}\)

=-8+1

=-7

\(\dfrac{\dfrac{5}{3}-\dfrac{5}{7}+\dfrac{5}{9}}{\dfrac{10}{3}-\dfrac{10}{7}+\dfrac{10}{9}}=\dfrac{5\left(\dfrac{1}{3}-\dfrac{1}{7}+\dfrac{1}{9}\right)}{10\left(\dfrac{1}{3}-\dfrac{1}{7}+\dfrac{1}{9}\right)}=\dfrac{1}{2}\)

2 tháng 5 2022

thank you

31 tháng 10 2023

17² - 17 + 17.84

= 17.(17 - 1 + 84)

= 17.100

= 1700