Mathematics
Junior High
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解法を教えてください！
(1⑪
右の図で, へABC と D
へDBE は, 合同な三角形
で, AB=テDB, BC=テBE., 70*
ンABC=70" である。 B C
DA/BC のとき, /EBC の大きさるヶ> を求めよ。
(埼玉)
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