(5x-2)(x+1)-(x-3)(5x+1)-17(x-2) (7x-3)(2x+1)-(5x-2)(x+4),-9*2-17x

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1. Đáp án:

    

   Giải thích các bước giải:

    $(5x-2)(x+1)-(x-3)(5x+1)-17(x-2)$
   $= (5x^2 – 2x + 5x -2) – (5x^2 +x – 15x – 3) – 17x + 34$
   $= (5x^2 – 5x^2)+(-2x+5x-x+15x-17x) +(-2+3+34)$
   $= 35$
   $(7x-3)(2x+1)-(5x-2)(x+4)-9^2 – 17x$
   $= (21x^2 – 6x + 7x – 3) -(5x^2-2x+20x-8) – 81 – 17x$
   $= (21x^2 – 5x^2)+(-6x+7x+2x-20x-17x)+(-3+8-81)$
   $= 16x^2 -34x -76$

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