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1、你可真狠 要这么多题目1. 5ax+5bx+3ay+3by 解法:=5x(a+b)+3y(a+b) =(5x+3y)(a+b) 2. x^3x^2+x1 解法:=(x^3x^2)+(x1) =x^2(x1)+ (x1) =(x1)(x^2+1) 3. x2xy2y 解法:=(x2y2)(x+y) =(x+y)(xy)(x+y) =(x+y)(xy1)bc(b+c)+ca(ca)ab(a+b) =bc(ca+a+b)+ca(ca)ab(a+b) =bc(ca)+bc(a+b)+ca(ca)ab(a+b) =bc(ca)+ca(ca)+bc(a+b)ab(a+b) =(bc+ca)(ca)+(bcab)(a+b) =c(ca)(b+a)+b(a+b)(ca) =(c+b)(ca)(a+b).x^2+3x40 =x^2+3x+2.2542.25 =(x+1.5)^2(6.5)^2 =(x+8)(x5).(x^2+x+1)(x^2+x+2)12时。
2、可以令y=x^2+x,则 原式=(y+1)(y+2)12 =y^2+3y+212=y^2+3y10 =(y+5)(y2) =(x^2+x+5)(x^2+x2) =(x^2+x+5)(x+2)(x1).(1+y)^22x^2(1+y^2)+x^4(1y)^2 解:原式=(1+y)^2+2(1+y)x^2(1+y)+x^4(1y)^22(1+y)x^2(1y)2x^2(1+y^2) =[(1+y)+x^2(1y)]^22(1+y)x^2(1y)2x^2(1+y^2) =[(1+y)+x^2(1y)]^2(2x)^2 =[(1+y)+x^2(1y)+2x]·[(1+y)+x^2(1y)2x] =(x^2x^2y+2x+y+1)(x^2x^2y2x+y+1) =[(x+1)^2y(x^21)][(x1)^2y(x^21)] =(x+1)(x+1xy+y)(x1)(x1xyy) x^5+3x^4y5x^3y^2+4xy^4+12y^5 解:原式=(x^5+3x^4y)(5x^3y^2+15x^2y^3)+(4xy^4+12y^5) =x^4(x+3y)5x^2y^2(x+3y)+4y^4(x+3y) =(x+3y)(x^45x^2y^2+4y^4) =(x+3y)(x^24y^2)(x^2y^2) =(x+3y)(x+y)(xy)(x+2y)(x2y) 分解因式m +5nmn5m 解:m +5nmn5m= m 5m mn+5n = (m 5m )+(mn+5n) =m(m5)n(m5) =(m5)(mn) 分解因式bc(b+c)+ca(ca)ab(a+b) 解:bc(b+c)+ca(ca)ab(a+b)=bc(ca+a+b)+ca(ca)ab(a+b) =bc(ca)+ca(ca)+bc(a+b)ab(a+b) =c(ca)(b+a)+b(a+b)(ca) =(c+b)(ca)(a+b) 1.(2ab)²+8ab2.y²2yx²+13.x²xy+yzxz4.6x²+5x45.2a²7ab+6b²6.(x²2x)²+2(x²2x)+17.(x²2x)²14(x²2x)15 8.x²(xy)+(yx)9.169(a+b)²121(ab)²10.(x3)(x5)+1 答案:1.(2ab)²+8ab=(2a+b)²2.y²2yx²+1=(y1)²x²=(y1x)(y1+x)3.x²xy+yzxz =x(xy)z(xy)=(xz)(xy)4.6x²+5x4 =(2x1)(3x+4)5.2a²7ab+6b²=(2a3b)(a2b)6.(x²2x)²+2(x²2x)+1 =(x²2x+1)²=(x1)^47.(x²2x)²14(x²2x)15 =(x²2x15)(x²2x+1)=(x+3)(x5)(x1)² 8.x²(xy)+(yx) =(x²1)(xy)=(x+1)(x1)(xy)9.169(a+b)²121(ab)² =(14a+14b11a+11b)(14a+14b+11a11b) =(3a+25b)(25a+3b)10.(x3)(x5)+1 =(x3)²2(x3)+1 =(x31)²=(x4)² 5a^2+16a=a(165a)8x^24x=4x(2x1)15p+10p^2=5p(3+2p)-3x^2y6xy=3xy(x+2y)14m^3n^26m^2n^3=2m^2n^2(7m6n)27a^2 b^3 c+18ab^2=9ab^2(3abc+2)18xy^2 z^3+12x^2 y^2=6xy^2(3z^3+2x)8m^2 n^2 6m^3 n^2=2m^2 n^2(43m)因式分解3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^22ac+3c^2) 3.因式分解xy+6-2x-3y=(x3)(y2) 4.因式分解x2(x-y)+y2(y-x)=(x+y)(xy)^2 5.因式分解2x2-(a-2b)x-ab=(2xa)(x+b) 6.因式分解a4-9a2b2=a^2(a+3b)(a3b) 7.若已知x3+3x2-4含有x-1的因式。
3、试分解x3+3x2-4=(x1)(x+2)^2 8.因式分解ab(x2-y2)+xy(a2-b2)=(ay+bx)(axby) 9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=2y(abc) 10.因式分解a2-a-b2-b=(a+b)(ab1) 11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3ab2(a+3b)]^2=(a7b)^2 12.因式分解(a+3)2-6(a+3)=(a+3)(a3) 13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=(x+1)(x+2) abc+ab-4a=a(bc+b4) (2)16x2-81=(4x+9)(4x9) (3)9x2-30x+25=(3x5)^2 (4)x2-7x-30=(x10)(x+3) 35.因式分解x2-25=(x+5)(x5) 36.因式分解x2-20x+100=(x10)^2 37.因式分解x2+4x+3=(x+1)(x+3) 38.因式分解4x2-12x+5=(2x1)(2x5) 39.因式分解下列各式: (1)3ax2-6ax=3ax(x2) (2)x(x+2)-x=x(x+1) (3)x2-4x-ax+4a=(x4)(xa) (4)25x2-49=(5x9)(5x+9) (5)36x2-60x+25=(6x5)^2 (6)4x2+12x+9=(2x+3)^2 (7)x2-9x+18=(x3)(x6) (8)2x2-5x-3=(x3)(2x+1) (9)12x2-50x+8=2(6x1)(x4) 40.因式分解(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x1) 41.因式分解2ax2-3x+2ax-3= (x+1)(2ax3) 42.因式分解9x2-66x+121=(3x11)^2 43.因式分解8-2x2=2(2+x)(2x) 44.因式分解x2-x+14 =整数内无法分解 45.因式分解9x2-30x+25=(3x5)^2 46.因式分解-20x2+9x+20=(4x+5)(5x+4) 47.因式分解12x2-29x+15=(4x3)(3x5) 48.因式分解36x2+39x+9=3(3x+1)(4x+3) 49.因式分解21x2-31x-22=(21x+11)(x2) 50.因式分解9x4-35x2-4=(9x^2+1)(x+2)(x2) 51.因式分解(2x+1)(x+1)+(2x+1)(x-3)=2(x1)(2x+1) 52.因式分解2ax2-3x+2ax-3=(x+1)(2ax3) 53.因式分解x(y+2)-x-y-1=(x1)(y+1) 54.因式分解(x2-3x)+(x-3)2=(x3)(2x3) 55.因式分解9x2-66x+121=(3x11)^2 56.因式分解8-2x2=2(2x)(2+x) 57.因式分解x4-1=(x1)(x+1)(x^2+1) 58.因式分解x2+4x-xy-2y+4=(x+2)(xy+2) 59.因式分解4x2-12x+5=(2x1)(2x5) 60.因式分解21x2-31x-22=(21x+11)(x2) 61.因式分解4x2+4xy+y2-4x-2y-3=(2x+y3)(2x+y+1) 62.因式分解9x5-35x3-4x=x(9x^2+1)(x+2)(x2)。
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