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 6: [7x-11]mũ 3 bằng 2 mũ 5 nhân 5 mũ 2 công 200

Toán Lớp 6: [7x-11]mũ 3 bằng 2 mũ 5 nhân 5 mũ 2 công 200

Comments ( 2 )

  1. ( 7x – 11 )^{3} = 2^{5} . 5^{2} + 200
    = ( 7x – 11 )^{3} = 32 . 25 + 200
    = ( 7x – 11 )^{3} = 800 + 200
    = ( 7x – 11 )^{3} = 1000
    = ( 7x – 11 )^{3} = 10^{3}
    =  7x – 11  = 10
    = 7x = 10 + 11
    => 7x = 21
    => x = 21 : 7
    => x = 3

  2. ( 7x – 11 )^3 = 2^5 . 5^2 + 200
    ⇔ ( 7x – 11 )^3 = 32 . 25 + 200
    ⇔ ( 7x – 11 )^3 = 800 + 200
    ⇔ ( 7x – 11 )^3 = 1000
    ⇔ ( 7x – 11 )^3 = 10^3
    ⇔ 7x – 11 = 10
    ⇔ 7x = 10 + 11
    ⇔ 7x = 21
    ⇔ x = 21 : 7
    ⇔ x = 3
    Vậy , x = 3 .

Leave a reply

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