因式分解与分式计算

因式分解分式计算题专项过关训练因式分解将下列各式分解因式

1.22x2+8x+813P2-6pq43a3-6a2b3x3y-xy+3ab

2.⑸Q2x_y+i6y-x6x2+y22-4x2y2⑺2x2-x816x2-l96xy2-9x2y-y3104+12x-y+9x-y2112a m2-8a124x3+4x2y+xy2133x-12x314x2+y22-4x2y215x2y-2xy2+y316x+2y2-y217n2m-2-n2-m18x-lx-3+119a2-4a+4-b221212,920a2-b2-2a+l-3+-3°+6X

3.Jo

220.73x32--x

73.237x2-63242ax-y-3by-x252xy-8xy+8y2793m+2n，26-a+2Q2—a28y2-l2+6l-y2+9222955-110X50+502-4m-2n231先因式分解，再求值:3x22+3-4x2y a+3,其a——1,x—3,y=]中分式的计算三一a ax+y•X2-ya+2a-1=12a2-1a2+4a+4a+^a2-1♦a221_x+yx-yx-3y2-6xy+9y2xX2_2x X+XX-11-X X-1二八-a+b_4\2ab+b2a2b-ab2a2-b2a2b-ab2-言Ui2，a3a.a+32a2+3a+2a+1a+2相―1_a b.2ab+b2b-a aa1J6x-2^x-1x-1x+11x-2x+

11.21----T-----=x+1X-12-1Y，A3x+2x-l-X（X-1）。