L3A

       First-Order, First-Degree Ordinary Differential Equations
       -Separation of Variables: Applecation of Homogeneous
        Equations-Ex10

L3B

       First-Order, First-Degree Ordinary Differential Equations
       -Separation of Variables: 

       (a1x＋b1y＋c1)dx＋(a2x＋b2y＋c2)dy=0 , a1/a2 is not
         equal to b1/b2 Concept

L3C

       First-Order, First-Degree Ordinary Differential Equations
       -Separation of Variables: 

       (a1x＋b1y＋c1)dx＋(a2x＋b2y＋c2)dy=0 , a1/a2 is not
        equal to b1/b2-Ex11

L3D

       First-Order, First-Degree Ordinary Differential Equations
       -Separation of Variables: 

       (a1x＋b1y＋c1)dx＋(a2x＋b2y＋c2)dy=0 ,
        a1/a2=b1/b2=m  -Ex12