当x当x<3/4,化简/x-2/+√(9-24x+16x^2)-³√[-(3-x)³]
当xx<3/4x-2<0,3-4x>0原式=|x-2|+√(3-4x)²-[-(3-x)]=|x-2|+|3-4x|+(3-x)=2-x+3-4x+3-x=8-6x