g) (5x+3)(2-x)+(x-1)^2 +4x^2 -5x h) (x-3)^2+(x+2)(1-x) i) 4x(3-x)+(2x-3)^2

0 bình luận về “g) (5x+3)(2-x)+(x-1)^2 +4x^2 -5x h) (x-3)^2+(x+2)(1-x) i) 4x(3-x)+(2x-3)^2”

1. a) `(5x+3)(2-x)+(x-1)^2 +4x^2 -5x`

   `= 10x+6-5x²-3x+x²-2x+1+4x²-5x`

   `= 7`

   b) `(x-3)^2+(x+2)(1-x)`

   `= x²-6x+9+x+2-x²-2x`

   `= -7x+11`

   c) `4x(3-x)+(2x-3)^2`

   `= 12x-4x²+4x²-12x+9`

   `= 9`

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2. Đáp án:

    

   Giải thích các bước giải:

    $g) (5x+3)(2-x)+(x-1)^2+ 4x^2- 5x$
   $= (10x + 6 – 5x^2 – 3x)+(x^2 – 2x +1) + 4x^2-5x$
   $= (-5x^2+x^2+4x^2)+(10x-3x-2x- 5x)+(6+1)$
   $= 7$

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

   $= (x^2 -x^2)+(-6x+x-2x)+(9+2)$
   $= -7x+11$

   $i)4x(3-x)+(2x-3)^2$
   $= 12x – 4x^2 +(4x^2 – 12x+9)$
   $= (-4x^2+4x^2)+(12x – 12x)+9$
   $= 9$

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