Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: a) 2x + 5 = 3^4 : 3^2 b) ( 3x – 2^4 ) . 7^3 = 2 . 7^4

Toán Lớp 7: a) 2x + 5 = 3^4 : 3^2
b) ( 3x – 2^4 ) . 7^3 = 2 . 7^4

Comments ( 2 )

  1. a) 2x + 5 = 3^{4} : 3^{2}
    2x + 5 = 3^{2}
    2x + 5 = 9
    2x        = 9 – 5
    2x        = 4
       x        = 4 : 2
       x        = 2
    Vậy x = 2
    b) ( 3x – 2^{4} ) . 7^{3} = 2 . 7^{4}
    ( 3x – 2^{4} ) = 4802
         3x – 2^{4} = 2 . (7^{4} : 7^{3}) = 14
         3x              = 14 + 2^{4} = 30
           x              = 30 : 3
           x              = 10
    Vậy x = 10

  2. a) 2x+5 = 3^4 : 3^2
         2x + 5 = 3^2
          2x + 5 = 9
          2x = 9-5
          2x = 4
           x = 4:2
           x=2
      Vậy x=2
    b) (3x-2^4) . 7^2 = 2.7^4
          3x – 16 = 2.7^4 : 7^3
          3x – 16 = 2.7
          3x – 16 = 14
         3x = 14+16
         3x = 30
           x = 30:3
           x = 10
       Vậy x=10

Leave a reply

222-9+11+12:2*14+14 = ? ( )