Mathematics
Junior High
一番最後の部分は、＋a-1で、かっこがなくても正解ですか？
(中22csEZmのDo
=ーァ?十(2gz十5Z)十(一1) ) 憧れてきた5!
=ニーz?二(2g十5)ァ十(g一1)
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