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

Toán Lớp 8: Tìm x : ( x – 5 ) ( x + 5 ) – x ( x – 3 ) = – 10

Toán Lớp 8: Tìm x : ( x – 5 ) ( x + 5 ) – x ( x – 3 ) = – 10

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     (x-5)(x+5)-x(x-3)=-10
    <=>x^2-25-x^2+3x=-10
    <=>3x-25=-10
    <=>3x=-10+25=15
    <=>x=15/3=5
     Vậy x=5

  2. $\text{*Ta có:(x-5).(x+5)-x.(x-3)=-10}$
    =>$\text{}$$x^{2}-$ $5^{2}-$ $x^{2}+3x=-10$ 
    $\Rightarrow$$\text{}$$x^{2}-25-$ $x^{2}+3x=-10$ 
    $\Rightarrow$$\text{-25+3x=-10}$
    $\Rightarrow$\text{3x=-10-(-25)}
    $\Rightarrow$\text{3x=15}
    $\Rightarrow$\text{x=15:3}
    $\Rightarrow$\text{x=5}
    \text{Kl:Vậy:x=5}
    \text{#Trang}

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