初二数学(上)化简求值的题我做题要用啊...

1个回答

  • 1- 14 x2 4x –2 x2 – 2 ( x- y )3 –(y- x) x2 –y2 – x + y x2 –y2 -1 ( x + y) (x – y ) x2 + 1 x2 -2-( x -1x )2 a3-a2-2a 4m2-9n2-4m+1 3a2+bc-3ac-ab 9-x2+2xy-y2 2x2-3x-1 -2x2+5xy+2y2 10a(x-y)2-5b(y-x) an+1-4an+4an-1 x3(2x-y)-2x+y x(6x-1)-1 2ax-10ay+5by+6x 1-a2-ab-14 b2 a4+4 (x2+x)(x2+x-3)+2 x5y-9xy5 -4x2+3xy+2y2 4a-a5 2x2-4x+1 4y2+4y-5 3X2-7X+2 8xy(x-y)-2(y-x)3 x6-y6 x3+2xy-x-xy2 (x+y)(x+y-1)-12 4ab-(1-a2)(1-b2) -3m2-2m+4 a2-a-6 2(y-z)+81(z-y) 9m2-6m+2n-n2 ab(c2+d2)+cd(a2+b2) a4-3a2-4 x4+4y4 a2+2ab+b2-2a-2b+1 x2-2x-4 4x2+8x-1 2x2+4xy+y2 - m2 – n2 + 2mn + 1 (a + b)3d – 4(a + b)2cd+4(a + b)c2d (x + a)2 – (x – a)2 –x5y – xy +2x3y x6 – x4 – x2 + 1 (x +3) (x +2) +x2 – 9 (x –y)3 +9(x – y) –6(x – y)2 (a2 + b2 –1 )2 – 4a2b2 (ax + by)2 + (bx – ay)2 x2 + 2ax – 3a2 3a3b2c-6a2b2c2+9ab2c3 xy+6-2x-3y x2(x-y)+y2(y-x) 2x2-(a-2b)x-ab a4-9a2b2 ab(x2-y2)+xy(a2-b2) (x+y)(a-b-c)+(x-y)(b+c-a) a2-a-b2-b (3a-b)2-4(3a-b)(a+3b)+4(a+3b)2 (a+3)2-6(a+3) (x+1)2(x+2)-(x+1)(x+2)2 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= .(1)(x+2)-2(x+2)2= .(2)36x2+39x+9= .(3)2x2+ax-6x-3a= .(4)22x2-31x-21= .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= x3+2x2+2x+1 a2b2-a2-b2+1 (1)3ax2-2x+3ax-2 (x2-3x)+(x-3)2+2x-6 1)(2x+3)(x-2)+(x+1)(2x+3) 9x2-66x+121 17.因式分解 (1)8x2-18 (2)x2-(a-b)x-ab 18.因式分解下列各式 (1)9x4+35x2-4 (2)x2-y2-2yz-z2 (3)a(b2-c2)-c(a2-b2) 19.因式分解(2x+1)(x+1)+(2x+1)(x-3) 20.因式分解39x2-38x+8 21.利用因式分解求(6512 )2-(3412 )2之值 22.因式分解a(b2-c2)-c(a2-b2) 24.因式分解7(x-1)2+4(x-1)(y+2)-20(y+2)2 25.因式分解xy2-2xy-3x-y2-2y-1 26.因式分解4x2-6ax+18a2 27.因式分解20a3bc-9a2b2c-20ab3c 28.因式分解2ax2-5x+2ax-5 29.因式分解4x3+4x2-25x-25 30.因式分解(1-xy)2-(y-x)2 31.因式分解 (1)mx2-m2-x+1 (2)a2-2ab+b2-1 32.因式分解下列各式 (1)5x2-45 (2)81x3-9x (3)x2-y2-5x-5y (4)x2-y2+2yz-z2 33.xy2-2xy-3x-y2-2y-1 34.因式分解y2(x-y)+z2(y-x) 1)因式分解x2+x+y2-y-2xy=