B = 5.4¹⁵.9⁹ - 4.3²⁰.8⁹

B = 5.(2²)¹⁵.(3²)⁹- (2²).3²⁰.(2³)⁹

B = 5.2³⁰.3¹⁸ - 2²⁹.3²⁰

B = 2²⁹.3¹⁸( 5.2 - 9)

B = 2²⁹.3¹⁸.(10-9)

B = 2²⁹.3¹⁸

\(\dfrac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)  (sửa \(-9^9\rightarrow.9^9\))

\(=\dfrac{5.2^{30}.3^{18}-2^2.3^{20}.2^{27}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)

\(=\dfrac{5.2^{30}.3^{18}-2^{29}.3^{20}}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}\)

\(=\dfrac{2^{29}.3^{18}\left(15-9\right)}{2^{28}.3^{18}\left(15-14\right)}\)

\(=2.6=12\)

\(\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}=\frac{5.2^{30}.3^{18}-2^2.2^{27}.3^{20}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)

\(=\frac{2^{29}.3^{18}\left(5.2-3^2\right)}{2^{28}.3^{18}.\left(5.3-7.2\right)}=\frac{2.1}{1}=2\)

sao bạn ra thế khó hỉu nhỉ

Mk cũng chẳng hỉu

=\(\frac{5\cdot2^{30}\cdot3^{18}-2^2\cdot3^{20}\cdot2^{27}}{5\cdot2^9\cdot\left(2\cdot3\right)^{19}-7\cdot2^{29}\cdot3^{18}}\)=\(\frac{5\cdot2^{30}\cdot3^{18}-3^{20}\cdot2^{29}}{5\cdot2^{28}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)=\(\frac{2^{29}\cdot3^{18}\cdot\left(5\cdot2-3^2\right)}{2^{28}\cdot3^{18}\left(5\cdot3-7\cdot2\right)}\)=2

f

ban lam sai roi ban bong da

\(\left(\frac{-6}{5}.8.9+\frac{5}{9}.\frac{6}{5}\right):\frac{1}{-5}\)

\(=\left[\frac{6}{5}.\left(-72\right)+\frac{6}{5}.\frac{5}{9}\right].\left(-5\right)\)

\(=\frac{6}{5}.\left(-72+\frac{5}{9}\right).\left(-5\right)\)

\(=\frac{6}{5}.\left(-\frac{648}{9}+\frac{5}{9}\right).\left(-5\right)\)

\(=\frac{6}{5}.\left(-\frac{643}{9}\right).\left(-5\right)\)

\(=\frac{6}{5}.\frac{3215}{9}\)

\(=\frac{1286}{3}=428\frac{2}{3}\)