1.4a^2-b^2+6a-3b2.a^2(b^2-c^2)-查字典问答网
分类选择

来自宋思洪的问题

  1.4a^2-b^2+6a-3b2.a^2(b^2-c^2)-c^2(b-c)(a+b)3.20x^2-43xy+14y^24.5x^2+4xy-28y^25.20x^2-43xy+14y^26.3x^2+12x-57.x^2+4x-48.x^2-2xy-35y^29.2x^2-7x-1510.x^4+2x^2-311.(x+y)^2-3(x+y)+212.4x^2-12x+513.x^2+2-3x

  1.4a^2-b^2+6a-3b

  2.a^2(b^2-c^2)-c^2(b-c)(a+b)

  3.20x^2-43xy+14y^2

  4.5x^2+4xy-28y^2

  5.20x^2-43xy+14y^2

  6.3x^2+12x-5

  7.x^2+4x-4

  8.x^2-2xy-35y^2

  9.2x^2-7x-15

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

  11.(x+y)^2-3(x+y)+2

  12.4x^2-12x+5

  13.x^2+2-3x

1回答
2020-08-3122:08
我要回答
提示:回答问题需要登录哦!
刘克中

  1.4a^2-b^2+6a-3b

  =(2a+b)(2a-b)+3(2a-b)

  =(2a-b)(2a+b+1)

  2.a^2(b^2-c^2)-c^2(b-c)(a+b)

  =a^2(b+c)(b-c)-c^2(b-c)(a+b)

  =(b-c)[a^2(b+c)-c^2(a+b)]

  3.20x^2-43xy+14y^2

  =(8x-7y)(5x-2y))

  4.5x^2+4xy-28y^2

  =(5x+14y)(x-2y)

  5.20x^2-43xy+14y^2

  =(8x-7y)(5x-2y))

  6.3x^2+12x-5

  =3(x+2)^2-17

  =3(x+2+√51/3)(x+2-√51/3)

  7.x^2+4x-4

  =(x+2)^2-8

  =(x+2+2√2)(x+2-2√2)

  8.x^2-2xy-35y^2

  =(x-y)^2-(6y)^2

  =(x+5y)(x-7y)

  9.2x^2-7x-15

  =(x-5y)(2x+3y)

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

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

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

  11.(x+y)^2-3(x+y)+2

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

  12.4x^2-12x+5

  =(2x-5)(2x-1)

  13.x^2+2-3x

  =(x-1)(x-2)

2020-08-31 22:08:38
大家都在问
最新问答