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<p><span data-ke-size="size20">어떤 분이 물어보셔서 풀어 봤어요</span></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/f6149501ae781dba2b73e3f2f88d1fd9ba430777" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/f6149501ae781dba2b73e3f2f88d1fd9ba430777" data-origin-width="1069" data-origin-height="312"></div><p><span data-ke-size="size20">가)에서 두점이 일치해도 상관없다</span></p><p><span data-ke-size="size20">두점을 A,B라고 하자 </span></p><p><span data-ke-size="size20">FAB의 둘레 = FA +FB +AB ≤ FA +FB + AF ` + F `B = 4a</span></p><p> </p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/6907e73f45bc6720da01aaadde625d15c7e4044b" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/6907e73f45bc6720da01aaadde625d15c7e4044b" data-origin-width="536" data-origin-height="82"></div><p> </p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/2aa7c412aef91ac612022325ce41d76164f7a175" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/2aa7c412aef91ac612022325ce41d76164f7a175" data-origin-width="958" data-origin-height="376"></div><p><span data-ke-size="size20">등호가 성립하는 경우는 </span></p><p><span data-ke-size="size20">F `를 지나는 임의의 직선과, 타원의 교점을 A,B로 할때가</span></p><p><span data-ke-size="size20">FAB의 둘레가 최대이고, 최대값은 4a</span></p><p> </p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/38996e9ef253839b89b2c6dd02db01e5b7d73d9a" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/38996e9ef253839b89b2c6dd02db01e5b7d73d9a" data-origin-width="513" data-origin-height="502"></div><p><span data-ke-size="size20">...................................................</span></p><p><span data-ke-size="size20">이것도 물어보셔서 설명하면</span></p><p><span data-ke-size="size20"><a href="https://cafe.daum.net/beautifulmath/Naaw/5203" target="_blank" class="ke-link">https://cafe.daum.net/beautifulmath/Naaw/5203</a></span></p><div class="figure-open" contenteditable="false" data-ke-type="opengraph" data-ke-align="alignCenter" data-og-type="website" data-og-title="Daum 카페" data-og-description="" data-og-host="cafe.daum.net" data-og-source-url="https://cafe.daum.net/beautifulmath/Naaw/5203" data-og-url="https://cafe.daum.net/_c21_/bbs_read?grpid=HL9t&fldid=Naaw&datanum=5203" data-og-image="//img1.kakaocdn.net/thumb/C200x200/?fname=https%3A%2F%2Ft1.daumcdn.net%2Fcafe_image%2Fcafe_meta_image_190529.png"><a href="https://cafe.daum.net/beautifulmath/Naaw/5203" target="_blank" data-source-url="https://cafe.daum.net/beautifulmath/Naaw/5203"><div class="og-image"><img src="//img1.kakaocdn.net/thumb/C200x200/?fname=https%3A%2F%2Ft1.daumcdn.net%2Fcafe_image%2Fcafe_meta_image_190529.png" alt="" xxxxonerror="this.src="//img1.kakaocdn.net/thumb/C200x200/?fname=https%3A%2F%2Ft1.daumcdn.net%2Fcafe_image%2Fcafe_meta_image_190529.png""></div><div class="og-text"><p class="og-title">Daum 카페</p><p class="og-desc"></p><p class="og-host">cafe.daum.net</p></div></a></div><p> </p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/b75bece6849e3f9b73894e5ef48cb80cd88dc5e9" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/b75bece6849e3f9b73894e5ef48cb80cd88dc5e9" data-origin-width="428" data-origin-height="270"></div><p> </p><p> </p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/HL9t/9b7ae7c670fa5715c2d790032465d43d145552a1" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/HL9t/9b7ae7c670fa5715c2d790032465d43d145552a1" data-origin-width="646" data-origin-height="601"></div><p> </p>
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