Mathematics
Senior High
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青線を引いてるところを詳しく教えてください。

理より AB AD=AC AED (A) 1 , AD=AB, AE=AC TS 31.2.: ①は 1/28 AB2=12/23 AC2となる。 AB² AC2 AB AC 3-2 3 3 82 3 4 よって, AB:AC=3:4 9 16 $3 (1)

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