x÷2+12=x-13,急

x-(x/2+12)=13急 x÷2+12=x-13,急 -2x(x-2)=12 急 x*x-10*x=13急 12x^3-44x^2+49x=15求x,急, x-x÷5=2.4 急 2x+4=4x+12 急 3(2+3x)=12x-66急! x^2-12x+44=0因式分解急 (x+2)(x+3)=20急, (x² +x+1)/(x² +1)+(2x² +x+2)/(x² +x+1) =19/6化成(x² +x+1)/(x² +1)+(x² +1)/(x² +x+1)=13/6急嗷 解方程:1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+...+1/(x+9)(x+10)=5/12 急 x-3分之2x=12 x加7分之2x=18 9分之4x-3=13 怎么写 急 快 (x=根号2)急, x^2-12=0,求(2x+1)(2x-1)-(x+1)^2+2x的值急 5x+9x=6x*2+12 x+9-x/3=4写过程 急 x+2x+2x=180° 急 1/【2x+(1-x方/x)】=急a