120x：2700-100x=3:2,两位都够速度吖！小女感激不尽~

4x两次方-3x+2=0 两道初二数学计算题（1）x+6/x^2+2x+1-x+4/x^2+x=0（2）x+3/x÷x^2+3x/x-3·1/3-x x-2x+3x-4x+5x.+99x-100x=25求解 2x+3x+4x+5x+x+6x+7x=100 设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x设一元二次方程x²-7x+3=0的两根为x^1,x^2,则x^1+x^2= ,x^1×x^2= ,（x^1-2）（x^2-2）= . 直角三角形两边长是方程X^2-16X+55=0两根,3Q 两道有关符号问题题目｜x=2｜+｜x-3｜ x+2=0 x=-2 x-3=0 x=3x＜-2-x-2-x-3=-2x=1x＞3x+2+x-3=2x-1-2≤x≤3x=2-x+3=5｜x-1｜+｜x+1｜ x-1=0 x=1 x+1=0 x=-1 x≤-1-x+1-x+1=2-2xx＞1x-1+x+1=2x-1＜x≤11-x+x+1=2两道题目都是零点 求下列方程两根的和与积：x^2-3x+2=105x^2+x-5=0x^2+x=5x+67x^2-5=x+8x^2-5x-10=02x^2+7x+1=03x^2-1=2x+5x(x-1)=3x+7 x+2x+3x+.+100x 100-2x+5x=120(x+3)×5-2x=30100-(4x+1)-(4x+1)=204x+8=6x-10 100-2x+5x=120(x+3)×5-2x=30100-(4x+1)-(4x+1)=204x+8=6x-10 √2x+1-√x+2=2√3 【赏100】√2x+1-√x+2=2√3还有两题 1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3).+1/(X+99)(X+100)= 解方程：2x+4x+6x...+100x=1-(x+3x+5x+...+99x) 1X+2X+3X…+98X+99X+100X=50500X X等于多少? 1x+2x+3x+4x+5x+6x+7x…+99x=100 两题填空题.x+y=-3,则5-2x-2y=_________.观察下列各式：(x-1)(x+1)=x^2-1,(x-1)(x^2+x+1)=x^3-1,(x-1)(x^3+x^2+x+1)…根据前面的各式规律可得(x-1)(x^n-x^n-1+…+x+1)=_______. 2(2x-1)-4(x+1)=3(x+1)-5(2x-1)两种方法解方程.