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 8: a) 3x + 5x = 3x + 8 b) 9x – 5x + 3x = 4 + 7

Toán Lớp 8: a) 3x + 5x = 3x + 8
b) 9x – 5x + 3x = 4 + 7

Comments ( 2 )

  1. Giải đáp:
     a,3x + 5x = 3x + 8
    ⇔ 3x + 5x – 3x =8
    ⇔ x(3 + 5 – 3) = 8
    ⇔ 5x = 8
    ⇒ x = 8/5
    Vậy x = 8/5
    b, 9x – 5x + 3x = 4 + 7
    ⇔ x(9 – 5 + 3) = 11
    ⇔ 7x = 11
    ⇔ x = 11/7
    Vậy x = 11/7

  2. a) 3x + 5x = 3x + 8
    =>3x-3x=8-5
    =>0x=3 (vô lí)
    => pt vô nghiệm
    b) 9x – 5x + 3x = 4 + 7
    =>8x= 11
    =>x=$\frac{11}{8}$ 
    vậy …
     

Leave a reply

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