1、求C点坐标 x=1,y=6/1=6 (1,6)
求B点坐标 y=2,x=6/2=3 (3,2)
S=(3-1)(6-2)=8
2、求C点坐标 x=m,y=6/m (m,6/m)
求B点坐标 y=n,x=6/n (6/n,n)
直线EF的函数为 y-n=[(6/m - n)/(m - 6/n)](x-6/n)
求E点x坐标 y=0,x= 6/n -(m^2n-6m)/(6-mn)
CF = CB = BE,即 6/n - (m^2n-6m)/(6-mn) - 6/n = 6/n - m = m
解得 mn = 3