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: Tìm x biết : 2^x-3 -3.2^x = -92

Toán Lớp 7: Tìm x biết : 2^x-3 -3.2^x = -92

Comments ( 2 )

  1. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-7-tim-biet-2-3-3-2-92

  2. 2^x-3-3.2^x=-92
    2^x.2^-3-2.3^x=-92
    2^x(2^-3-3)=-92
    2^x.(1/8-3)=-92
    2^x.-23/8=-92
    2^x=-92:-23/8
    2^x=32
    2^x=2^5
    ⇒x=5
    vậy x=5

Leave a reply

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