因式分解练习题：1.5ax+5bx+3ay+3by解法：=5x(a+b)+3y(a+b)=(5x+3y)(a+b)2.x^3-x^2+x-1解法：=(x^3-x^2)+(x-1)=x^2(x-1)+ (x-1)=(x-1)(x^2+1)3.x2-x-y2-y解法：=(x2-y2)-(x+y)=(x+y)(x-y)-(x+y)=(x+y)(x-y-1)4、bc(b...