∵x-y-2是x^2+axy+by^2-5x+y+6的一个因式 ∴商式是：x+(a+1)-3(x-y-2)[x+(a+1)y-3]=x^2+(a+1)xy-3x-xy-(a+1)y^2+3y-2x-2(a+1)y+6=x^2+axy-(a+1)y^2-5x+(1-2a)y+6x^2+axy+by^2-5x+y+6-(x-y-2)[x+(a+1)y-3]=(a+b+1)y^2...