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: 19.(2+3+4-5+6-7)mũ 2-9.(7x-2)=0

Toán Lớp 6: 19.(2+3+4-5+6-7)mũ 2-9.(7x-2)=0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     19 . (2 + 3 + 4 – 5 + 6 – 7)^2 – 9 . (7x – 2) = 0
    19 . 3^2 – 9(7x – 2) = 0
    19 . 9 – 9(7x-2) = 0
    171 – 9(7x – 2) = 0
    9(7x – 2) = 0 + 171
    9(7x – 2) = 171
    7x – 2 = 171 : 9
    7x – 2 = 19
    7x = 19 + 2
    7x = 21
    x = 21 : 7
    x = 3
    Vậy x = 3

  2. 19 × ( 2 + 3 + 4 – 5 + 6 – 7 )^2 – 9 × ( 7x – 2 ) = 0
    19 × 3^2 – 9 × ( 7x – 2 ) = 0
    19 × 9 – 9 × ( 7x – 2 ) = 0
    171 – 9 × ( 7x – 2 ) = 0
    9 × ( 7x – 2 ) = 171 – 0
    9 × ( 7x – 2 ) = 171
    7x – 2 = 171 : 9
    7x – 2 = 19
    7x = 19 + 2
    7x = 21
    x = 21 : 7
    x = 3
    – Vậy x = 3
    @Rin

Leave a reply

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