化简求值:(X×根号X+X×根号y)÷(XY-Y²)-(X+根号XY+Y)÷X×根号X-Y×根号Y,其中X=1,Y=4

问题描述:

化简求值:(X×根号X+X×根号y)÷(XY-Y²)-(X+根号XY+Y)÷X×根号X-Y×根号Y,其中X=1,Y=4

(x√x+x√y)÷(xy-y²)-(x+√xy+y)÷x×√x-y×√y
=(1+2)÷(4-16)-(1+2+4)-4×2
=-15又1/4