Question

若x的平方-4x+9y的平方-12y+8=0,求6x+3分之2y

Answer 1

x^2-4x+9y^2-12y+8=0

则(x-2)^2+(3y-2)^2=0

则x-2=0,3y-2=0

x=2,y=2/3

则6x+2y/3=6*2+2/3*2/3=12+4/9=112/9