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

Toán Lớp 8: Rút gọn biểu thức sau: (x + 2) (x – 2) + 5 (x – 4)

Toán Lớp 8: Rút gọn biểu thức sau:
(x + 2) (x – 2) + 5 (x – 4)

Comments ( 2 )

  1. Gửi bạn:
    $(x+2)(x-2)+5(x-4)$
    $=x^2-4+5x-20$
    $=x^2+5x-24$
    $→$ $(A-B)(A+B)=A^2-B^2$

  2. ( x + 2 ) ( x – 2 ) + 5 ( x – 4 )
    = x^2 – 4 + 5x – 20
    = x^2 + 5x – 24

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