Mathematics
Senior High
この等式が成り立つことを示す問題なのですが、解説をお願いしたいです🙇♀️
国 本 4 次の等式が成り立つことを示せ。
(1) AC+CD+DB=AB
(2) AC+BD = AD+BC
(2) -=AC+BD-AD-BC
よって
=(AC-AD)+(BD-BC)
=DC+CD=DD=6
AC+BD=AD+BC
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