Mathematics
Senior High
（2））が−4になる理由を教えてください！
解き方の解説お願いします
四辺形となるような点Bの座標を
9 右の図のようなひし形ABCD において,次の
内積を求めよ。
(1) ABAD
20
(3) ABCBO
D
2
.P.26
135
145°
(2) DA BC
C
.
B
n28
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