\(9x-2\times3^2=3^4\)

\(3^2\times x-2\times3^2=3^4\)

\(3^2\times\left(x-2\right)=3^4\)

           \(x-2=3^4\div3^2\)

           \(x-2=3^2\)

           \(x-2=9\)

                 \(x=9+2\)

                 \(x=11\)

\(9x-2.3^2=3^4\)

\(3^2.x-2.3^2=3^4\)

\(3^2.\left(x-2\right)=3^4\)

\(x-2=3^2\)

\(x-2=9\)

\(x=11\)

Đề 1 :

`9x-2.32=34`

`=>9x-64=34`

`=>9x=34+64`

`=>9x=98`

`=>x=98/9`

Đề 2 : 

`9x - 2 . 3^2 = 3^4`

`=> 9x - 2 . 9 = 81`

`=> 9x - 18 = 81`

`=> 9x = 81 + 18`

`=> 9x = 99`

`=> x = 11`

     b. 27.63 + 27.37

       =[63 + 37].27

       =100.27

       =2700

alo 

b: \(1024:2^5+140:\left(38+2^5\right)+2\cdot3^2-7^{23}:7^{21}\)

\(=1024:32+140:\left(38+32\right)+2\cdot9-7^2\)

=32+140:70+18-49

=50-49+2

=1+2

=3

c: \(100:\left\lbrace300:\left\lbrack450-\left(4\cdot5^3-2^3\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(4\cdot125-8\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(500-200\right)\right\rbrack\right\rbrace\)

=100:{300:[450-300]}

=100:{300:150}

=100:2

=50

18

dẽ mà bn

=2.9

=18

Hok tốt:V

2.3² - 4³: (16.2)

= 2.9 - 64: 32

= 18 - 2

= 16

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