已知x=根号5+根号3/2,y=根号5-根号3/2,求下列各式的值 1.x²-3xy+y² 2.y/x+x/y

x=√5+√3/2 y=√5-√3/2则,x+y=2√5 xy=5-3/4=17/41)x²-3xy+y² =(x+y)²-5xy=(2√5)²-5*17/4=20-105/4=-25/42) y/x+x/y=(x²+y²)/xy=(x+y)²/xy-2=20/(17/4)-2=80/17-2=46/17...