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就是有2b=a+c兩邊平方得4b²;=a²;+2ac+c²;又b²;=a²;-c²;則有4(a²;-c²;)=a²;+2ac+c²;即5c²;+2ac-3a²;=0兩邊÷a²;得5c²;/a²;+2c/a-3=0又e=c/a則化為5e&…
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