问题:

1.(3x²+2x-8)²-(x²-2x-8)²2.(x+2)(x+3)+x²-43.x²(a-b)+16(b-a)4.(x²+2x)²-7(x²+2x)-85.(x²+9y²)²-36x²y²6.(x-1)(x-2y-1)+y²

更新时间:2024-04-28 03:39:15

问题描述:

钱迎雪回答:

  1.

  (3x²+2x-8)²-(x²-2x-8)²

  =(3x²+2x-8+x²-2x-8)(3x²+2x-8-x²+2x+8)

  =(4x²-16)(2x²+4x)

  =8(x²-4)(x²+2x)

  =8x(x+2)(x-2)(x+2)

  =8x(x+2)^2(x-2)

  2.

  (x+2)(x+3)+x²-4

  =x^2+5x+6+x^2-4

  =2x^2+5x+2

  =(x+2)(2x+1)

  3.

  x²(a-b)+16(b-a)

  =(a-b)(x^2-16)

  =(a-b)(x+4)(x-4)

  4.

  (x²+2x)²-7(x²+2x)-8

  =(x^2+2x-8)(x^2+2x+1)

  =(x-2)(x+4)(x+1)^2

  5.

  (x²+9y²)²-36x²y²

  =(x²+9y²+6x²y²)(x²+9y²-6x²y²)

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

  6.

  (x-1)(x-2y-1)+y²

  =x^2-2xy-x-x+2y+1+y²

  =x^2-2xy+y²-2x+2y+1

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

  =(x-y-1)^2

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