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: Tìm x biết: 2x (5 – 3x) + 2x (3x – 5) – 3 (x – 7) = 30

Toán Lớp 8: Tìm x biết:
2x (5 – 3x) + 2x (3x – 5) – 3 (x – 7) = 30

Comments ( 2 )

  1. 2x . ( 5 – 3x ) + 2x . ( 3x – 5 ) – 3 . ( x – 7 ) = 30
    ⇔ 2x . ( 5 – 3x + 3x – 5 ) – 3 . ( x – 7 ) = 30
    ⇔ 2x . 0 – 3 . ( x – 7 ) = 30
    ⇔ 0 – 3 . ( x – 7 ) = 30
    ⇔ – 3 . ( x – 7 ) = 30
    ⇔ x – 7 = 30 : ( – 3 )
    ⇔ x – 7 = – 10
    ⇔ x = – 10 + 7
    ⇔ x = – 3
    Vậy , x = – 3 .

  2. Giải đáp:
     x = -3
    Lời giải và giải thích chi tiết:
     2x ( 5 – 3x ) + 2x ( 3x – 5 ) – 3 ( x – 7 ) = 30
    2x ( 5 – 3x + 3x – 5 ) – 3 ( x – 7 ) = 30
    2x . 0 – 3x + 21 = 30
    -3x + 21 = 30
    -3x = 30 – 21
    -3x = 9
    x = 9 : ( -3 )
    x = -3
    Vậy x = -3
    CHÚC BẠN HỌC TỐT!!

Leave a reply

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