1/12x+1/18x*(16-x)=11/12x+8/9x-1/18x^2=11/18X^2-35/36x+1=0x^2-35/2x+18=0********公式法a=1...b=-35/2...c=18△=b^2-4ac=1225/4-72=937/4>0[-b±√(b^2-4ac)]/2a=[35/2±√(937/4)]/2=(35/2±√937/2)/2x1=(35...