求100道因式分解
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求100道因式分解
求100道因式分解
求100道因式分解
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.因式分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= 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= . (1) 答案:a(b−1)(ab+2b+a) 说明:(ab+b)2−(a+b)2 = (ab+b+a+b)(ab+b−a−b) = (ab+2b+a)(ab−a) = a(b−1)(ab+2b+a). (2) 答案:(x−a)4 说明:(a2−x2)2−4ax(x−a)2 = [(a+x)(a−x)]2−4ax(x−a)2 = (a+x)2(a−x)2−4ax(x−a)2 = (x−a)2[(a+x)2−4ax] = (x−a)2(a2+2ax+x2−4ax) = (x−a)2(x−a)2 = (x−a)4. (3) 答案:7xn−1(x−1)2 说明:原式 = 7xn−1 •x2−7xn−1 •2x+7xn−1 = 7xn−1(x2−2x+1) = 7xn−1(x−1)2.
140.m2(p-q)-p+q141.(2m+3n)(2m-n)-4n(2m-n).142.(x+2y)2-x2-2xy.143.a(ab+bc+ac)-abc.144.ab-a-b+1.145.xyz-xy-xz+x-yz+y+z-1.146.x4-2y4-2x3y+xy3.148.abc(a2+b2+c2)-a3bc+2ab2c2.149.(a-b-c)(a+b-c)-(b-c-a)(b+c-a).150.a2(b-c)+b2(c-a)+c2(a-b).a(a+b)(a-b)-a(a+b)2.152.(x2-2x)2+2x(x-2)+1.153.2acd-c2a-ad2.154.(x-y)2+12(y-x)z+36z2.156.x2-4ax+8ab-4b2.157.a2b2+c2d2-2abcd+2ab-2cd+1.158.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx).160.(1-a2)(1-b2)-(a2-1)2(b2-1)2.161.3x4-48y4.162.(x+1)2-9(x-1)2.163.(x2+pq)2-(p+q)2x2.164.(1+2xy)2-(x2+y2)2.165.4a2b2-(a2+b2)2.166.4a2b2-(a2+b2-c2)2.167.(c2-a2-b2)2-4a2b2.168.(x2-b2+y2-a2)2-4(ab-xy)2.169.64a4(x+1)2-49b4(x+1)4.170.ab2-ac2+4ac-4a.171.4a2-c2+6ab+3bc.172.x3n+y3n.174.(x+y)3+125.176.(m-n)6-(m+n)6.177.(x+1)6-(x-1)6.178.a12-b12.179.(z-x)3-(y+z)3.180.(3m-2n)3+(3m+2n)3.181.x6(x2-y2)+y6(y2-x2).182.8(x+y)3+1.183.(a-1)3-(b+1)3.184.(a+b+c)3-a3-b3-c3.185.x2+4xy+3y2.186.x2y2-18xy+65.187.x2+18x-144.188.x2+30x+144.189.x4+2x2-8.190.3x4+6x2-9.191.-m4+18m2-17.192.3x4-7x2y2-20y4.193.x5-2x3-8x.194.a3-5a2b-300ab2.195.x8+19x5-216x2.196.6a4n+k-a2n+k-35ak.199.30x2+8xy-182y2.200.m4+14m2-15.140.(p-q)(m-1)(m+1).141.(2m-n)2.142.2y(x+2y).143.a2(b+c).144.(b-1)(a-1).145.(x-1)(y-1)(z-1).提示:方法一 原式=x(yz-y-z+1)-(yz-y-z+1)=(yz-y-z+1)(x-1)=[y(z-1)-(z-1)](x-1)=(x-1)(y-1)(z-1).方法二 原式=xy(z-1)-x(z-1)-y(z-1)+(z-1)=(xy-x-y+1)(z-1)=[x(y-1)-(y-1)](z-1)=(x-1)(y-1)(z-1).146.(x-2y)(x+y)(x2-xy+y2).提示:方法一 原式=x(x3+y3)-2y(x3+y3)=(x3+y3)(x-2y)=(x-2y)(x+y)(x2-xy+y2).方法二 原式=x3(x-2y)+y3(x-2y)=(x-2y)(x3+y3)=(x-2y)(x+y)(x2-xy+y2).148.abc(b+c)2.提示:原式=abc(a2+b2+c2-a2+2bc).149.2(b-c)(a-b-c).提示:原式=(a-b-c)(a+b-c)+(a-b-c)(b-c-a)=(a-b-c)[(a+b-c)+(b-c-a)]=2(b-c)(a-b-c).150.(a-b)(b-c)(a-c).提示:原式=a2b-a2c+b2c-ab2+c2(a-b)=(a2b-ab2)-(a2c-b2c)+c2(a-b)=ab(a-b)-c(a2-b2)+c2(a-b)=(a-b)[ab-c(a+b)+c2]=(a-b)[a(b-c)-c(b-c)]=(a-b)(b-c)(a-c).提示:原式=a(a+b)[a-b-(a+b)]=a(a+b)(-2b)=-2ab(a+b);152.(x-1)4.提示:原式=[x(x-2)]2+2•x(x-2)+12=[x(x-2)+1]2=(x2-2x+1)2=(x-1)4.153.-a(c-d)2.154.(x-y-6z)2.156.(x-2b)(x-4a+2b).157.(ab-cd+1)2.提示:原式=(a2b2-2abcd+c2d2)+2(ab-cd)+1=(ab-cd)2+2(ab-cd)+1=(ab-cd+1)2.158.(ax+by+ay-bx)2.160.(1+a)(1-a)(1+b)(1-b)(a2+b2-a2b2).161.3(x2+4y2)(x+2y)(x-2y).162.4(2x-1)(2-x).163.(x2+px+qx+pq)(x2-px-qx+pq).164.(1+x-y)(1-x+y)(x2+y2+2xy+1).165.-(a+b)2(a-b)2.166.(a+b+c)(a+b-c)(c+a-b)(c-a+b).提示:原式=(2ab+a2+b2-c2)(2ab-a2-b2+c2)=[(a+b)2-c2][c2-(a-b)2]=(a+b+c)(a+b-c)(c+a-b)(c-a+b).167.(c+a-b)(c-a+b)(c+a+b)(c-a-b).168.(x+y+a+b)(x+y-a-b)(x-y+a-b)(x-y-a+b).提示:原式=(x2-b2+y2-a2+2ab-2xy)(x2-b2+y2-a2-2ab+2xy)=[(x2-2xy+y2)-(a2-2ab+b2)][(x2+2xy+y2)-(a2+2ab+b2)]=[(x-y)2-(a-b)2][(x+y)2-(a+b)2]=(x-y+a-b)(x-y-a+b)(x+y+a+b)(x+y-a-b).169.(x+1)2(8a2+7b2x+7b2)(8a2-7b2x-7b2).170.a(b-c+2)(b+c-2).提示:原式=a(b2-c2+4c-4)=a(b2-c2+2b-2b+2c+2c-4)=a[(b-c)(b+c)-2(b-c)+2(b+c)-4]=a[(b-c)+2][(b+c)-2].171.(2a+c)(2a-c+3b).172.(xn+yn)(x2n-xnyn+y2n).174.(x+y+5)(x2+2xy+y2-5x-5y+25).176.-4mn(3n2+m2)(3m2+n2).提示:原式=[(m-n)3]2-[(m+n)3]2=[(m-n)3+(m+n)3][(m-n)3-(m+n)3]=2m[(m-n)2-(m-n)(m+n)(m+n)2]×{-2n[(m-n)2+(m-n)(m+n)+(m+n)2]}=-4mn(m2+3n2)(3m2+n2).177.4x(x2+3)(3x2+1).提示:原式=[(x+1)3]2-[(x-1)3]2=[(x+1)3+(x-1)3][(x+1)3-(x-1)3]=2x[(x+1)2-(x+1)(x-1)+(x-1)2]×2[(x+1)2+(x+1)(x-1)+(x-1)2]=4x(x2+3)(3x2+1).178.(a-b)(a+b)(a2+b2)(a2+ab+b2)(a2-ab+b2)(a4-a2b2+b4).提示:原式=(a6)2-(b6)2=(a6+b6)(a6-b6)=[(a2)3+(b2)3][(a3)2-(b3)2]=(a2+b2)(a4-a2b2+b4)(a3+b3)(a3-b3).179.-(x+y)(x2+y2+3z2-xy+3yz-3xz).180.18m(3m2+4n2).181.(x+y)2(x-y)2(x2-xy+y2)(x2+xy+y2).提示:原式=(x2-y2)(x6-y6)=(x+y)(x-y)(x3+y3)(x3-y3).182.(2x+2y+1)(4x2+8xy+4y2-2x-2y+1).183.(a-b-2)(a2+ab+b2-a+b+1).184.3(b+c)(a+b)(c+a).提示:原式=[(a+b+c)3-a3]-(b3+c3).185.(x+3y)(x+y).186.(xy-13)(xy-5).187.(x-6)(x+24).188.(x+6)(x+24).189.(x2-2)(x2+4).190.3(x2+3)(x+1)(x-1).191.(m2-17)(1+m)(1-m).192.(3x2+5y2)(x+2y)(x-2y).193.x(x+2)(x-2)(x2+2).194.a(a-20b)(a+15b).195.x2(x+3)(x2-3x+9)(x-2)(x2+2x+4).提示:原式=x2(x6+19x3-216)=x2(x3+27)(x3-8)=x3(x+3)(x2-3x+9)(x-2)(x2+2x+4).196.ak(2a2n-5)(3a2n+7).199.2(3x-7y)(5x+13y).200.(m2+15)(m+1)(m-1).201.m2(p-q)-p+q;202.a(ab+bc+ac)-abc;203.x4-2y4-2x3y+xy3;204.abc(a2+b2+c2)-a3bc+2ab2c2;205.a2(b-c)+b2(c-a)+c2(a-b);206.(x2-2x)2+2x(x-2)+1;207.(x-y)2+12(y-x)z+36z2;208.x2-4ax+8ab-4b2;209.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx);210.(1-a2)(1-b2)-(a2-1)2(b2-1)2;211.(x+1)2-9(x-1)2;212.4a2b2-(a2+b2-c2)2;213.ab2-ac2+4ac-4a;214.x3n+y3n;215.(x+y)3+125;216.(3m-2n)3+(3m+2n)3;217.x6(x2-y2)+y6(y2-x2);218.8(x+y)3+1;219.(a+b+c)3-a3-b3-c3;220.x2+4xy+3y2;221.x2+18x-144;222.x4+2x2-8;223.-m4+18m2-17;224.x5-2x3-8x;225.x8+19x5-216x2;226.(x2-7x)2+10(x2-7x)-24;227.5+7(a+1)-6(a+1)2;228.(x2+x)(x2+x-1)-2;229.x2+y2-x2y2-4xy-1;230.(x-1)(x-2)(x-3)(x-4)-48;231.x2-y2-x-y;232.ax2-bx2-bx+ax-3a+3b;233.m4+m2+1;234.a2-b2+2ac+c2;235.a3-ab2+a-b;236.625b4-(a-b)4;237.x6-y6+3x2y4-3x4y2;238.x2+4xy+4y2-2x-4y-35;239.m2-a2+4ab-4b2;240.5m-5n-m2+2mn-n2.参考答案:三、因式分1.(p-q)(m-1)(m+1).8.(x-2b)(x-4a+2b).11.4(2x-1)(2-x).20.(x+3y)(x+y).21.(x-6)(x+24).27.(3+2a)(2-3a).31.(x+y)(x-y-1).38.(x+2y-7)(x+2y+5).