如图,①/(①+②)=x²/1².∴①/②=x²/(1-x²),.∴①=[x²/(1-x²)]②,
x×1/2=2①+②=[(1+x²/(1-x²)]②.∴②=x(1-x²)/[2(1+x²)]
①+②=x/[2(1+x²)]
S(PQRS)=1-4(①+②)=(1-x)²/(1+x²)
如图,①/(①+②)=x²/1².∴①/②=x²/(1-x²),.∴①=[x²/(1-x²)]②,
x×1/2=2①+②=[(1+x²/(1-x²)]②.∴②=x(1-x²)/[2(1+x²)]
①+②=x/[2(1+x²)]
S(PQRS)=1-4(①+②)=(1-x)²/(1+x²)