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). 9/4x-25%x=1 B). x+80%x=1

Toán Lớp 7: A). 9/4x-25%x=1
B). x+80%x=1

Comments ( 2 )

  1. A).9/4x-25%x=1
    ⇔x(9/4-25%) = 1
    ⇔x(9/4-1/4)=1
    ⇔x .2=1
    ⇒x=1÷2=1/2
    Vậy x=1/2
    B).x+80%x=1
    ⇔ x (1+80%)=1
    ⇔x(1+4/5)=1
    ⇔x.9/5=1
    ⇒x=1÷9/5 = 5/9
    Vậy x = 5/9

  2. a) 9/4 x – 25% x = 1
    x(9/4 – 25%) = 1
    x . 2 = 1
    x = 1 ÷ 2
    x = 1/2
    b) x + 80%x = 1
    x(1 + 80%) = 1
    x . 9/5 = 1
    x = 1 ÷ 9/5
    x = 5/9

Leave a reply

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