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1、例题h(1)xyXy+1(2)5x152x+3(3)7x-3y+xy一21xX(X1)(X2)-6(5)ab(x1+1)+x(a+/?)(6)2bmlSbn+4+y2)+2xy+2xy)U-5,y)+(x3y)(x5y)十(龙一2y)U一4y)(4)r5-r4+ar-(5)r-y+2+bx-by+ab(6)2-9y2-3y(7)x2-y2-z2-2yz(8)-2-+l(9)n1+ntri0v(y-2)(m-1)(,*+1)4例题4：(1)(+c)(c)+b(b+2/)(2)+2cb-b(3)/-Or-/+y(4)4-2+4x-4t+9)；-9y5)*+2a+2a+2+1(6).t2-y+xy-
2、+y-j(7)a+46+4b-ac-2c(8)+r2+at+1(9)xyxzy+2yzZQtD.vy2xz+za-2ay例题6：(1)2ar4bx+2x3ay+6by-3y(2)Cj+4Z?4a+8b4ab(3)x5+x4-2x3-2x2+x+l(4)x2-8xy+16+6x-24j+9(5)4f+l(6)*-32+i(7)3-7+6(8)a2-ab+ac-bcab1-尸Q16yz+25-16-4z2例题9：(1)/-2+a2-9(2)U+2)(x-2)-4y(x-)(3)x2(x+l)-y2(y+l)4/-4(ab+4)+2(53(+x-l)-l(6)(2-2x)?-2xy+x2y(7)ar
3、(y3+/)+外(次？+ay(8)“*+“22+匕“(9)a，+a+a3-VJ+6x+1Ix+6例题10：(1)2(x+1)-y2(y+1)+xy2m2(n+2)-12w-3n2(m-3)(X+2)(X-2)-4)，(X-y)-5(4)(l-x2)(l-)-4jx+8+V+X*+-+13+6力3c6?C(T)2a(a2+a+)+a4+/+1(8)/-4+y-2xy(9)-3x2+40+9j+26x+24例题Ih(DX2-21Jty+98./+%-7),$+丁-/J-例,-1(3)16/-9/-32+16(4)2x-X2-2x+1(5)%1-6x+1Ix-6(6)3+6%-3a2c-6abc(7)4+/从+/一1片+25(9)/+4%?+1Gb4ab+4cd-/6-4bd+8bcd例题12t(l)x2+6xy+9y2-2x-6y+l(2)m?+？+Gn6mImn+9x-7x-8
