(3x + 2)(2x + 9) – (x + 2)(x + 1) = (x + 1) – (x – 6)

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1. Trả lời

   (3x+2)(2x+9)-(x+2)(x+1)=(x+1)-(x-6)

   6x²+18-x²+2=(x+1)-(x-6)

   6x²-x²+(18+2)= (x+1)-(x-6)

   6x²-x²+20=(x+1)-(x-6)

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2. Bạn tham khảo :

   $(3x+2)(2x+9) – (x+2)(x+1) = (x+1) – (x+6)$

   $6x^2 + 18 – x^2 + 2 = (x+1) – (x+6)$

   $6x^2 – x^2 + 18 + 2 = (x+1) – (x+6)$

   $ 6x^2 – x^2   + 20 = (x+1) – (x+6)$

     

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