D(g)+B(g)=E(g) H2 A(g)+B(g)=C(g) H1
X X X*H2 Y Y Y*H1
X*H2+ Y*H1=H3
X+Y=1
(1-Y)*H2+ Y*H1=H3
Y(H1-H2）=H3-H2
Y=(H3-H2)/(H1-H2)
X=1-Y=(H1-H3)/(H1-H2)
X/Y=(H1-H3)/(H3-H2)
不就是D吗,上下都变号.