y=2/x
过M(1,m)
m=2/1
m=2
y=-6/x
过N(n,3)
3=-6/n
n=-2
M(1,2)、N(-2,3)
|MN|=√((1+2)^2+(2-3)^2)
=√10
MN方程:(y-2)/(x-1)=(3-2)/(-2-1)
3(y-2)=-(x-1)
x+3y-5=0
O到MN的距离:
d=|-5|/√(1^2+3^2)
=5/√10
=1/2√10
SΔOMN=1/2|MN|d
=1/2*√10*1/2√10
=1/4*10
=5/2
=2.5
y=2/x
过M(1,m)
m=2/1
m=2
y=-6/x
过N(n,3)
3=-6/n
n=-2
M(1,2)、N(-2,3)
|MN|=√((1+2)^2+(2-3)^2)
=√10
MN方程:(y-2)/(x-1)=(3-2)/(-2-1)
3(y-2)=-(x-1)
x+3y-5=0
O到MN的距离:
d=|-5|/√(1^2+3^2)
=5/√10
=1/2√10
SΔOMN=1/2|MN|d
=1/2*√10*1/2√10
=1/4*10
=5/2
=2.5