1.|x||x-1|-3
1.x(x+1)(x+2)(x+3)+1
1.(x-2)(x+2)-(x+1)(x-3)
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
1.(x²-9)/(x²+2x²+x)*(3x³+9x²)/(x
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
解方程:1.x/x+1-1=3/(x+1)(x-2) 2.3/x+2+1/x=4/x²+2x 3.2/3+x/
1.求数列1,x+x^2,x^2+x^3+x^4,x^3+x^4+x^5+x^6,...前n项之和
1.f(x)=1-x² 2.f(x)=-3x+1 3.f(x)=2/x 4.f(x)=(x-x²)/
1.x²-3x-18≤0 2.-x²+x≥3x+1