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

Toán Lớp 8: (x-3)(x-7)-x^2=0 giúp mình nha

Toán Lớp 8: (x-3)(x-7)-x^2=0
giúp mình nha

Comments ( 2 )

  1. (x-3)(x-7)-x^2 =0
    <=> -10x+21=0
    <=> -10x=-21
    <=> x=\frac{21}{10} 

  2. Lời giải và giải thích chi tiết:
    (x – 3)(x – 7) – x^2 = 0
    ⇔ x(x – 7) – 3(x – 7) – x^2 = 0
    ⇔ x^2 – 7x – 3x + 21 – x^2 = 0
    ⇔ -10x + 21 = 0
    ⇔ 10x = 21
    ⇔ x = 21/10
    Vậy  x = 21/10

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