初一因式分解练习题300道300道,我真的很着急,(x+2)-查字典问答网
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  初一因式分解练习题300道300道,我真的很着急,(x+2)(x-3)+(x+2)(x+4)150道就行冀教版

  初一因式分解练习题300道

  300道,

  我真的很着急,

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

  150道就行

  冀教版

1回答
2019-05-10 05:47
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季娟

  (1)a的四次方+a²+1

  =a^4+2a²+1-a²

  =(a²+1)²-a²

  =(a²+a+1)(a²-a+1)

  (2)2a²-7ab+6b²

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

  (3)3x²+xy-2y²

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

  (4)10a²b²+11ab-6

  =(2ab+3)(5ab-2)

  (5)7a³x-28a(x的五次方)

  =7a³(x-4a²)

  (6)x³-10x²+16x

  =x(x²-10x+16)

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

  (7)(x²+3x)²-2(x²+3x)-8

  =(x²+3x+2)(x²+3x-4)

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

  (8)(x-y)²+4xy-1

  =x²-2xy+y²+4xy-1

  =x²+2xy+y²-1

  =(x+y)²-1

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

  9.x^2-4xy+4y^2-x+2y-2

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

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

  10.x³+ax²+bx²+cx²+abx+bcx+acx+ab

  =x³+cx²+abx+abc+bx²+bcx+ax²+acx

  =x²(x+c)+ab(x+c)+bx(x+c)+ax(x+c)

  =(x+c)[x²+bx+ab+ax]

  =(x+c)[x(x+b)+a(x+b)]

  =(x+a)(x+b)(x+c)

  11.x²-y²-y-1/2

  =x²-(y²+y+1/4)

  =x²-(y+1/2)²

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

  12.x的四次方+3x³+6x²-4

  =x^4+x³+2x³+2x²+4(x²-1)

  =x³(x+1)+2x²(x+1)+(4x-4)(x+1)

  =(x+1)(x³+2x²+4x-4)

  13.x³-3x²+4

  =x³+1-3(x²-1)

  =(x+1)(x²-x+1)-(3x-3)(x+1)

  =(x+1)(x²-4x+4)

  =(x+1)(x-2)²

  14.32a[(x^2+2x)^2]-2a

  =2a[16(x^2+2x)^2-1]

  =2a(4x^2+8x+1)(4x^2+8x-1)

  15.16+8(x^2+4x)+(x^2+4x)^2

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

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

  =(x+2)^4

  16.3x^ny+9x^(n-1)y^2+x^(n+1)/4

  =x^(n-1)(3xy+9y^2+x^2/4)

  =x^(n-1)(x^2/4+3xy+9y^2)

  =x^(n-1)(x/2+3y)^2

  =(1/4)[x^(n-1)](x+6y)^2

  17.a^4+a³+3a-5

  =a²*(a²+a)+3a-5

  =3a²+3a-5

  =3(a²+a)-5

  18.1+x+x(x+1)+x(x+1)^2+x(x+1)^3

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

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

  =(1+x)²(1+x)+x(x+1)^3

  =(1+x)³(1+x)

  =(1+x)^4

  19.(x-y)(2x-2y-3)-2

  =(x-y)[2(x-y)-3]-2

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

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

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

  x2-3xy-10y2+x+9y-2=(x-5y+2)(x+2y-1).

  x2-y2+5x+3y+4=(x+y+1)(x-y+4).

  xy+y2+x-y-2=(y+1)(x+y-2).

  6x2-7xy-3y2-xz+7yz-2z2=(2x-3y+z)(3x+y-2z).

  a^2+2b^2+3c^2+3aB+4ac+5bc=(a+b+c)(a+2b+3c)

  x^2-8x+7=(x-1)(x-7)

  X^2+8X+7=(x+1)(x+7)

  X^2-10X-11=(x-11)(x+1)

  x^2+10X-11=,(x+11)(x-1)

  X^+3x-18=(x+6)(x-3)

  x^2+11X+18=(x+2)(x+9)

  x^2-11x+18=(x-2)(x-9)

  x^2+17X-18=(x+18)(x-1)

  X^2-17X-18=(x-18)(x+1)

  xy+6-2x-3y=(x-3)(y-2)

  x2(x-y)+y2(y-x)=(x+y)(x-y)^2

  2x2-(a-2b)x-ab=(2x-a)(x+b)

  a4-9a2b2=a^2(a+3b)(a-3b)

2019-05-10 05:50:07

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