20道初二因式分解题目,急!

2个回答

  • 1.若2x3+3x2+mx+1为x+1的倍式,则m=

    2.因式分解3a3b2c-6a2b2c2+9ab2c3=

    3.因式分解xy+6-2x-3y=

    4.因式分解x2(x-y)+y2(y-x)=

    5.因式分解2x2-(a-2b)x-ab=

    6.因式分解a4-9a2b2=

    7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=

    8.因式分解ab(x2-y2)+xy(a2-b2)=

    9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=

    10.因式分解a2-a-b2-b=

    11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=

    12.因式分解(a+3)2-6(a+3)=

    13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=

    14.若2×4×(32+1)×(34+1)×(38+1)×(316+1)=3n-1,求n= .

    15.利用平方差公式,求标准分解式4891= .

    16.2x+1是不是4x2+5x-1的因式?答:.

    17.若6x2-7x+m是2x-3的倍式,则m=

    18.x2+2x+1与x2-1的公因式为 .

    19.若x+2是x2+kx-8的因式,求k= .

    20.若4x2+8x+3是2x+1的倍式请因式分解4x2+8x+3= .

    21.2x+1是4x2+8x+3的因式,请因式分解4x2+8x+3= .

    22.(1)x+2 (2)x+4 (3)x+6 (4)x-6 (5)x2+2x3+24 上列何者x2-2x-24的因式 (全对才给分)

    23.因式分解下列各式:

    (1)abc+ab-4a= .

    (2)16x2-81= .

    (3)9x2-30x+25= .

    (4)x2-7x-30= .

    24.若x2+ax-12=(x+b)(x-2),其中a、b均为整数,则ab= .

    25.请将适当的数填入空格中:x2-16x+ =(x- )2.

    26.因式分解下列各式:

    (1)xy-xz+x= ;(2)6(x+1)-y(x+1)=

    (3)x2-5x-px+5p= ;(4)15x2-11x-14=

    27.设7x2-19x-6=(7x+a)(bx-3),且a,b为整数,则2a+b=

    28.利用乘法公式展开99982-4= .

    29.计算(1.99)2-4×1.99+4之值为 .

    30.若x2+ax-12可分解为(x+6)(x+b),且a,b为整数,则a+b= .

    31.已知9x2-mx+25=(3x-n)2,且n为正整数,则m+n= .

    32.若2x3+11x2+18x+9=(x+1)(ax+3)(x+b),则a-b= .

    33.2992-3992=

    34.填入适当的数使其能成为完全平方式4x2-20x+ .

    35.因式分解x2-25= .

    36.因式分解x2-20x+100= .

    37.因式分解x2+4x+3= .

    38.因式分解4x2-12x+5= .

    39.因式分解下列各式:

    (1)3ax2-6ax= .

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

    (3)x2-4x-ax+4a= .

    (4)25x2-49= .

    (5)36x2-60x+25= .

    (6)4x2+12x+9= .

    (7)x2-9x+18= .

    (8)2x2-5x-3= .

    (9)12x2-50x+8= .

    40.因式分解(x+2)(x-3)+(x+2)(x+4)= .

    41.因式分解2ax2-3x+2ax-3= .

    42.因式分解9x2-66x+121= .

    43.因式分解8-2x2= .

    44.因式分解x2-x+14 = .

    45.因式分解9x2-30x+25= .

    46.因式分解-20x2+9x+20= .

    47.因式分解12x2-29x+15= .

    48.因式分解36x2+39x+9= .

    49.因式分解21x2-31x-22= .

    50.因式分解9x4-35x2-4= .

    51.因式分解(2x+1)(x+1)+(2x+1)(x-3)= .

    52.因式分解2ax2-3x+2ax-3= .

    53.因式分解x(y+2)-x-y-1= .

    54.因式分解(x2-3x)+(x-3)2= .

    55.因式分解9x2-66x+121= .

    56.因式分解8-2x2= .

    57.因式分解x4-1= .

    58.因式分解x2+4x-xy-2y+4= .

    59.因式分解4x2-12x+5= .

    60.因式分解21x2-31x-22= .

    61.因式分解4x2+4xy+y2-4x-2y-3= .

    62.因式分解9x5-35x3-4x= .

    63.因式分解下列各式:

    (1)3x2-6x= .

    (2)49x2-25= .

    (3)6x2-13x+5= .

    (4)x2+2-3x= .

    (5)12x2-23x-24= .

    (6)(x+6)(x-6)-(x-6)= .

    (7)3(x+2)(x-5)-(x+2)(x-3)= .

    (8)9x2+42x+49= .

    64.9x2-30x+k可化为完全平方式(3x+a)2,则k= a= .

    65.若x2+mx-15可分解为(x+n)(x-3),m、n皆为整数,则m= n= .

    66.求下列各式的和或差或积或商.

    (1)(6512 )2-(3412 )2= .

    (2)(7913 )2+2×7913 ×23 +49 = .

    (3)1998×0.48-798×0.48-798×0.52+1998×0.52= .

    67.因式分解下列各式:

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

    (2)36x2+39x+9= .

    (3)2x2+ax-6x-3a= .

    (4)22x2-31x-21= .

    68.利用平方差,和的平方或差的平方公式,填填看

    (1)49x2-1=( +1)( -1)

    (2)x2+26x+ =(x+ )2

    (3)x2-20x+ =(x- )2

    (4)25x2-49y2=(5x+ )(5x- )

    (5) -66x+121=( -11)2

    69.利用公式求下列各式的值

    (1)求5992-4992= (2)求(7512 )2-(2412 )2=

    (3)求392+39×22+112= (4)求172-34×5+52=

    (5)若2x+5y=13 +7 ,x-4y=7 -13 求2x2-3xy-20y2=

    70.因式分解3ax2-6ax= .

    71.因式分解(x+1)x-5x= .

    72.因式分解(2x+1)(x-3)-(2x+1)(x-5)=

    73.因式分解xy+2x-5y-10=

    74.因式分解x2y2-x2-y2-6xy+4= .