c2/a2-c2/(c2-a2)=1 如何计算c/a等于多少?a2中2指平方

c^2/a^2-c^2/(c^2-a^2)=1c^2/a^2-1=c^2/(c^2-a^2)(c^2-a^2)/a^2=c^2/(c^2-a^2)(c^2-a^2)^2=a^2c^2c^2-a^2=ac或 c^2-a^2=-acc^2-ac-a^2=0或 c^2+ac-a^2=0c=(1±√5)a/2 或 c=(-1±√5)a/2所以c/a=(1±√5)/2或 c/a=(-...