(x^2-3)^2+12(3-x^2)+36
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
(x+1)(x+2)(x+3)(x-4)+36
x^2+3x-36
x^2-3x
(x+3)(x-2)
x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1
(x^21+x^15+x^12+x^9+x^6+x^3+1)/(x^2+x+1)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(x-2)(x-3)+2(x-5)(x+6)-3(x^2-7x+12)
约分 (X的平方+4x+3)(2x-x)^/(X^+X)(X^+X-6),
解方程:2x(x-1)-x(3x+2)=-x(x+2)-12