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

Toán Lớp 8: rút gọn A a = (x-3) (x+ 2) + (x-4) (x +4) – 2(x^2 +1)

Toán Lớp 8: rút gọn A
a = (x-3) (x+ 2) + (x-4) (x +4) – 2(x^2 +1)

Comments ( 2 )

  1. A = (x – 3)(x + 2) + (x – 4)(x + 4) – 2(x^2 + 1)
       = x^2 – 3x + 2x – 6 + x^2 – 16 – 2x^2 – 2
    = (x^2 – 2x^2 + x^2) – (3x – 2x) – 16 – 6- 2
    = -x – 24
     

  2. $\text{A=(x-3)(x+2)+(x-4)(x+4)-2(x²+1)}$
    $\text{A=x²+2x-3x-6+x²-16-2x²-2}$
    $\text{A=-x-24}$
     

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