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

Toán Lớp 8: 2x(x-5)-x(3+2x)=26 lm nhanh cho mk vs nhé

Toán Lớp 8: 2x(x-5)-x(3+2x)=26
lm nhanh cho mk vs nhé

Comments ( 2 )

  1. 2x(x-5) -x(3+2x) =26
    <=> 2x^2 – 10x – 3x -2x^2 =26
    <=> (2x^2 -2x^2) – (10x +3x) =26
    <=> -13x =26
    <=> x = -2
    Vậy x = -2 

  2. $\text{2x( x – 5 ) – x( 3 + 2x ) = 26}$
    $\text{⇒2$x^{2}$ – 10x – 3x – 2$x^{2}$ = 26}$
    $\text{⇒-10x – 3x = 26}$
    $\text{⇒-13x = 26}$
    $\text{⇒x = -2}$
    $\text{Vậy x = -2}$

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

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