x^2 -9+2(x+3) x^2-10x+5-3(x-5) x^3-4x^2+3x

0 bình luận về “x^2 -9+2(x+3) x^2-10x+5-3(x-5) x^3-4x^2+3x”

1. Đáp án:

   Giải thích các bước giải:

   a, x ² – 9 + 2.(x+3) = (x – 3).(x+3) + 2.(x + 3) = (x + 3).(x – 3 + 2) = (x + 3).(x – 1)

   b, x ² -10x + 25 – 3.(x – 5)

   = (x – 5) ² – 3.(x – 5)

   = (x – 5).(x – 5 – 3)

   = (x – 5).(x – 8)

   c, x ³ – 4x ² + 3x = x ³ – x ² – 3x ² + 3x = x ².(x – 1) – 3x.(x -1) = x.(x – 1).(x – 3)

   Trả lời

2. Đáp án: a. x^2-9+2(x+3)

   =(x-3)(x+3)+2(x+3)

   =(x+3)(x-1)

   b. x^2-10x+5-3(x-5)

   =(x-5)^2-3(x-5)

   =(x-5)(x-8)

   c. x^3-4x^2+3x

   =x(x^2-4x+3)

   =x(x^2-1x-3x+3)

   =x([x(x-1)-3(x-1)])

   =x(x-3)(x-1)

   Trả lời