a ) 9 . 3x = 81

          3x = 9

            x = 3

b ) 2x : 4 = 1

     2x      = 4

       x      = 2

c ) 2x - 64 = 2

     2x        = 66

       x        = 33

d ) 2x = 16

       x  = 8

e ) 3 ^ 2 . 3 ^ 4 . 3x = 3 ^ 10

     3 ^ ( 2 + 4 + x )  = 3 ^ 10

=> 2 + 4 + x = 10

                 x = 4

f ) 2x + 4 . 2x = 5 . 2 ^ 5

    2x + 8 x     = 160

    10x            = 160

        x            = 16

\(a.9.3x=81\)

\(3x=81:9\)

\(3x=9\)

\(x=9:3\)

\(x=3\)

Ta có: \(A=\dfrac{5\cdot\left(2^2\cdot3^2\right)^9\cdot\left(2^2\right)^6-2\cdot\left(2^2\cdot3\right)^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{5\cdot2^{18}\cdot3^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^4}{5\cdot2^{28}\cdot3^{18}-7\cdot2^{28}\cdot3^{18}\cdot2}\)

\(=\dfrac{5\cdot2^{30}\cdot3^{18}-2\cdot2^{28}\cdot3^{18}}{2^{28}\cdot3^{18}\cdot\left(5-7\cdot2\right)}\)

\(=\dfrac{2^{28}\cdot3^{18}\cdot\left(5\cdot2^2-2\right)}{2^{28}\cdot3^{18}\cdot\left(5-14\right)}\)

\(=\dfrac{20-2}{-9}=\dfrac{18}{-9}=-2\)

\(\frac{5.\left(2^2.3^2\right)^9\left(2^2\right)^6-2.\left(2^2.3\right)14.3^{ }^4}{22}\)

\(A=\frac{5.2^{18}.3^{18}.2^{12}-2.2^{28}.3^{14}.3^4}{5.2^{28}.3^{18}-7.2^{29}.3^{18}}\)

\(A=\frac{5.2^{30}.3^{18}-2^{29}.3^{18}}{5.2^{28}.3^{18}-7.2^{29}.3^{18}}\)

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

\(A=\frac{2^2-1}{1-7}\)

\(A=\frac{3}{-6}=\frac{1}{-2}=-\frac{1}{2}\)

bài này ư hơi dễ đó nhìn sơ qua là biết

Cảm ơn các bạn nhé

\(\left(5.2^3-2.3^2\right):11+5-\left|-5\right|\\ =\left(5.8-2.9\right):11+5-5\\ =\left(40-18\right):11\\ =22:11\\ =2\)

Thằng ngu 1 năm rồi

thì sao

\(M=\dfrac{5\cdot2^{18}\cdot3^{18}\cdot2^{12}-2\cdot2^{28}\cdot3^{14}\cdot3^6}{5\cdot2^{38}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{5\cdot2^{30}\cdot3^{18}-2^{29}\cdot3^{20}}{2^{28}\cdot3^{18}\left(5\cdot3-7\cdot2\right)}=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-3^2\right)}{2^{28}\cdot3^{18}}=2\)