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

Toán Lớp 7: $\frac{x-1}{x+2}$ = $\frac{x-2}{x+3}$

Toán Lớp 7: $\frac{x-1}{x+2}$ = $\frac{x-2}{x+3}$

Comments ( 2 )

  1. Giải đáp:
    x=-1/2 
    Lời giải và giải thích chi tiết:
    (x-1)/(x+2)=(x-2)/(x+3)
    <=> (x-1)(x+3)=(x-2)(x+2)
    <=> x(x+3)-(x+3)=x^2-2^2
    <=> x^2+3x-x-3=x^2-4
    <=> x^2+2x-3=x^2-4
    <=> x^2+2x-3-x^2+4=0
    <=> (x^2-x^2)+2x+(4-3)=0
    <=> 2x+1=0
    <=> 2x=-1
    <=> x=-1/2
    Vậy x=-1/2 

  2. ⇔ (x – 1)(x + 3) = (x – 2)(x + 2)
    ⇔ x² + 2x – 3 = x² – 4
    ⇔ 2x – 3 = – 4
    ⇔ 2x = -1
    ⇔ x = -1/2

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

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