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\(121-5.\left(60-5x\right)=21^{10}:\left(21^6.21^3\right)\)
\(121-5.\left(60-5x\right)=21^{10}:21^9\)
\(121-5.\left(60-5x\right)=21\)
\(5.\left(60-5x\right)=121-21\)
\(5.\left(60-5x\right)=100\)
\(60-5x=100:5\)
\(60-5x=20\)
\(5x=60-20\)
\(5x=20\)
\(\Rightarrow x=4\)
\(121-5.\left(60-5x\right)=21^{10}:\left(21^6.21^3\right)\)
\(121-300+25x=21^{10}:21^{11}\)
\(25x-179=\frac{1}{21}\)
\(25x=\frac{1}{21}+179\)
\(25x=\frac{3760}{21}\)
\(x=\frac{3760}{21}:25\)
\(x=\frac{752}{105}\)
vay \(x=\frac{752}{105}\)
C = \(\frac{4}{40}+\frac{16}{42}+\frac{6}{15}+\left(\frac{-3}{5}\right)+\frac{2}{21}+\left(\frac{-10}{21}\right)+\frac{3}{20}\)
C = \(\left(\frac{4}{40}+\frac{3}{20}\right)+\left(\frac{16}{42}+\frac{-10}{21}+\frac{2}{21}\right)+\left(\frac{6}{15}+\frac{-3}{5}\right)\)
C = \(\frac{1}{4}+0+\frac{-1}{5}\)
C = \(\frac{1}{20}\)
A . \(3\cdot\dfrac{5}{4}-\dfrac{3^2}{4}=\dfrac{15}{4}-\dfrac{9}{4}=\dfrac{6}{4}=\dfrac{3}{2}\)
B, \(\dfrac{-3}{2}\cdot\left(\dfrac{7}{3}-\dfrac{5}{3}\cdot4\right)=\dfrac{-3}{2}\cdot\left(\dfrac{7}{3}-\dfrac{20}{3}\right)=\dfrac{-3}{2}\cdot\dfrac{-13}{2}=\dfrac{39}{4}\)
C , \(\dfrac{-21}{10}+\dfrac{21}{10}\cdot\dfrac{3}{4}-\dfrac{3}{4}=\dfrac{-84}{40}+\dfrac{63}{40}-\dfrac{30}{40}=\dfrac{-84+63-30}{40}=\dfrac{-51}{40}\)
D , \(\dfrac{-2}{3}+2\cdot\left(\dfrac{-2}{3}\right)\cdot3-3=\dfrac{-2}{3}\left(1+2\cdot3\right)-3=\dfrac{-2}{3}\cdot7-3=\dfrac{-14}{3}-\dfrac{9}{3}=-\dfrac{23}{3}\)
\(\frac{3^{10}.\left(-5\right)^{21}}{\left(-5\right)^{21}.3^{12}}\)\(=\)\(\frac{1}{3^2}\)\(=\frac{1}{9}\)
a,\(\frac{-3}{5}-\left(\frac{-2}{5}+2\right)=\frac{-3}{5}-\frac{8}{5}=1\)
b,\(\frac{-21}{10}+\frac{21}{10}.\frac{5}{7}=-\frac{21}{10}+\frac{105}{70}=-\frac{21}{10}+\frac{15}{10}=-\frac{6}{10}\)
\(\frac{27^3+9^{10}.2^4+4^2.81^5}{3^{10}+3^{21}.2^5}\)
=\(\frac{3^9+3^{20}.2^4+2^4.3^{20}}{3^{10}+3^{21}.2^5}\)
=\(\frac{3^{18}+2^3}{1}\)
= \(3^{18}+2^3\)
Hk tốt
bằng -33 nhé