1.(x-2)(x+2)-(x+1)(x-3)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
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
1.(x-2)(x+2)-(x+1)(x-3)
1.x(x+1)(x+2)(x+3)+1
1+x+x^2+x^3+.+x^99+x^100
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
1.通分3x/x+1,2x+6/x,x方-9/x-1
1.x/9+x=62.x/x+1 + x+1/2x = 3
x(2-1/x)+x/(x^2-2x)÷(3-x)/(x^2-4)
x(x+1)^3+x(x+1)^2+x(x+1)+x+1因式分解
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)