4x@+y@-4x+10y+26=0,则6x-1/5y=

4x²+y²-4x+10y+26=0
4x²-4x+1+y²+10y+25=0
(2x-1)²+(y+5)²=0
(2x-1)²=0,(y+5)²=0
x=1/2
y=-5
6x-1/5y
=6*(1/2)-1/5*(-5)
=3+1
=4

4x^2+y^2-4x+10y+26=0,推出(2x-1)^2+(y+5)^2=0,所以2x-1=0,y-5=0,所以x等于二分之一，y等于5，所以6x-1/5y=3-1=2