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

Toán Lớp 8: Tìm x: 7x ( 3 – x ) + 4 ( x – 3 ) = 0

Home/ Toán Lớp 8: Tìm x: 7x ( 3 – x ) + 4 ( x – 3 ) = 0

Toán Lớp 8: Tìm x: 7x ( 3 – x ) + 4 ( x – 3 ) = 0

Tháng Chín 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Tìm x:
7x ( 3 – x ) + 4 ( x – 3 ) = 0

Comments ( 2 )

  1. thucquyenlan
    thucquyenlan
    4 Tháng Chín, 2022 at 12:48 sáng
    Reply
    $\\$
    7x(3-x)+4(x-3)=0
    <=> 7x (3-x)-4(3-x)=0
    <=> (3-x)(7x-4)=0
    <=> \(\left[ \begin{array}{l}3-x=0\\7x-4=0\end{array} \right.\) <=>  \(\left[ \begin{array}{l}x=3\\x=\dfrac{4}{7}\end{array} \right.\) 
    Vậy x=3,x=4/7
     

  2. daolanhoa
    daolanhoa
    4 Tháng Chín, 2022 at 12:48 sáng
    Reply
    7x(3-x) + 4(x-3)=0
    7x(3-x) – 4(3-x) =0
    (3-x)(7x-4)=0
    =>\(\left[ \begin{array}{l}3-x=0\\7x-4=0\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=3\\x=\frac{4}{7}\end{array} \right.\) 
    \text{Vậy} x ∈{ 3; 4/7}
     

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

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