我是說ABCE的麵積就是ABD和BCD的麵積,如果ABCD麵積達到最小,
在BD不變的情況下,ABD和BCD都要最小。
我是說ABCE的麵積就是ABD和BCD的麵積,如果ABCD麵積達到最小,
在BD不變的情況下,ABD和BCD都要最小。
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