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CHAPTER 7. ANALYTIC GEOMETRY
640. bèì~íáçå=çÑ=~=`áêÅäÉ=`ÉåíÉêÉÇ=~í=íÜÉ=lêáÖáå=Epí~åÇ~êÇ=
cçêãF=
ñ + ó = o =
O
O
O
====== =
=
Figure 112.
=
641. bèì~íáçå=çÑ=~=`áêÅäÉ=`ÉåíÉêÉÇ=~í=^åó=mçáåí=( ÄI~ )
( )ñ − O ( ~ + Ä = o
)ó −
O
O
Figure 113.
150
