(1+X)×(X÷2)＝55怎么解?

(1+X)×(X÷2)＝55怎么解? x*x+2*x+1=36,x怎么解, -x-1>-x+2 怎么解, (x+2)(1-x)>0怎么解? x2>2x/(x+1)怎么解 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 x+x÷2+x÷3>11 怎么解 1/3X＝X-10×2怎么解方程 请问x-2x=2x+1怎么解 x(x-1)(x-2)=120怎么解? x*(x+1)*(x+2)=1320怎么解 x²+2x+1=4.X怎么解 2x-(x+3-3(x+1)怎么解 x+(x-1)+(x-2)=48 怎么解 |X+1|小于等于|2-X|.怎么解X 1/(x+1)(x+2)+1/(x+3)(x+4)+1/(x+5)(x+6)+1/(x+7)(x+8)+1/(x+9)(x+10)怎么解 x-1+x-2+x-3+x-4+x-5+x-6+x-7=77怎么解速度! 3x(x^2-2x+1)-2x^2(x+1)这道题怎么解