\(\frac{27^3+9^{10}.2^4+4^2.81^5}{3^{10}+3^{21}.2^5}\)

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19 tháng 9 2018

  \(\frac{27^3+9^{10}.2^4+4^2.81^5}{3^{10}+3^{21}.2^5}\)

=\(\frac{3^9+3^{20}.2^4+2^4.3^{20}}{3^{10}+3^{21}.2^5}\)

=\(\frac{3^{18}+2^3}{1}\)

\(3^{18}+2^3\)

Hk tốt

7 tháng 3 2018

b)  \(\frac{4}{10}+\frac{-2}{9}+\frac{-3}{-5}+\frac{21}{-27}+\frac{-10}{20}\)

\(=\frac{2}{5}-\frac{2}{9}+\frac{3}{5}-\frac{7}{9}-\frac{1}{2}\)

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

\(=1-1-\frac{1}{2}=-\frac{1}{2}\)

7 tháng 3 2018

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

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

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

\(=-1+\frac{3}{4}\)

\(=-\frac{1}{4}\)

9 tháng 4 2017

a) \(3.\frac{5}{4}\)\(-\frac{3^2}{4}\)\(=\frac{3}{2}\)

b)\(\frac{-21}{10}\)\(+\frac{21}{10}\)\(-\frac{3}{4}\)\(-\frac{3}{4}\)\(=\left(\frac{-21}{10}+\frac{21}{10}\right)-\left(\frac{3}{4}+\frac{3}{4}\right)\)

\(=0-\frac{3}{2}\)\(=\frac{-3}{2}\)

c) \(\frac{3}{4}\)\(+\frac{9}{5}-\frac{3}{2}-1\)\(=\left(\frac{3}{4}-\frac{3}{2}\right)+\left(\frac{9}{5}-1\right)\)\(=\frac{-3}{4}\)\(+\frac{4}{5}\)\(=\frac{1}{20}\)

11 tháng 2 2017

a. \(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

\(\Rightarrow\frac{7}{9}:\left(2+\frac{3}{4}x\right)=\frac{23}{27}-\frac{5}{9}\)

\(\Rightarrow\frac{7}{9}:\left(2+\frac{3}{4}x\right)=\frac{8}{27}\)

\(\Rightarrow2+\frac{3}{4}x=\frac{7}{9}:\frac{8}{27}\)

\(\Rightarrow2+\frac{3}{4}x=\frac{21}{8}\)

\(\Rightarrow\frac{3}{4}x=\frac{21}{8}-2\)

\(\Rightarrow\frac{3}{4}x=\frac{5}{8}\)

\(\Rightarrow x=\frac{5}{8}:\frac{3}{4}\)

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

b. \(\frac{-2}{3}x+\frac{1}{5}=\frac{3}{10}\)

\(\Rightarrow\frac{-2}{3}x=\frac{3}{10}-\frac{1}{5}\)

\(\Rightarrow\frac{-2}{3}x=\frac{1}{10}\)

\(\Rightarrow x=\frac{1}{10}:\left(\frac{-2}{3}\right)\)

\(\Rightarrow x=\frac{-3}{20}\)

c. \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)

\(\Rightarrow\left|x\right|=\frac{5}{3}+\frac{3}{4}\)

\(\Rightarrow\left|x\right|=\frac{29}{12}\)

\(\Rightarrow x=\frac{29}{12}\) hoặc \(x=-\frac{29}{12}\)

18 tháng 4 2018

a) \(\frac{7}{11}\)

b)\(\frac{218}{165}\)

c)\(\frac{1}{4}\)

d)\(\frac{-21}{20}\)

e)\(\frac{2}{9}\)

g) 1

h)\(\frac{-561}{26}\)

i)\(\frac{4}{3}\)

1 tháng 8 2020

spam. cho mình xóa nhaa :3

16 tháng 7 2017

1/ \(\frac{9.5^{20}.27^9-3.9^{15}.25^9}{7.3^{29}.125^6-3.3^9.15^{19}}\)

\(=\frac{5^{20}.3^{29}-3^{31}.5^{18}}{7.3^{29}.5^{18}-3^{29}.5^{19}}=\frac{3^{29}.5^{18}.\left(25-9\right)}{3^{29}.5^{18}.\left(7-5\right)}=\frac{16}{2}=8\)

CÁC BÀI CÒN LẠI TƯƠNG TỰ HẾT NHÉ E

27 tháng 3 2019

\(a.\frac{108}{119}.\frac{107}{211}+\frac{108}{119}.\frac{104}{211}=\frac{108}{119}.\left(\frac{107}{211}+\frac{104}{211}\right)=\frac{108}{119}.1=108\)