MATCH.GRADE TOW如图

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MATCH.GRADETOW如图MATCH.GRADETOW如图MATCH.GRADETOW如图证明：作EF垂直BD于F点因为三角形ABC是等边三角形所以AB=AC=BC角B=60°所以角BEF=30

MATCH.GRADE TOW如图
MATCH.GRADE TOW

如图

MATCH.GRADE TOW如图
证明：作EF垂直BD于F点
因为三角形ABC是等边三角形
所以 AB=AC=BC 角B=60°
所以角BEF=30°
所以 BE=2BF
即 AB+AE=2(BC+CF)
即 BC+BC+CD=2BC+2CF
得 CD=2CF
所以 CF=FD
因为 EF垂直BD
所以三角形CDE的等腰三角形
所以 CE=DE

MATCH.GRADE TOW如图 what class are you in?_________class tow,grade six. the boys of grade two are ____ a basketball match. there is going to be a football match between class one and class tow.的意思 grade Grade 英文句子cindy and frank _______in class tow ,grade seven 横线上应该填什么?是一道问题英语翻译如例子:︴match火柴名词match 比赛动词 Match match ... tow 就是 tow chaer！ ____of the Grade ____ students have taken part in this activityA Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth D Tow-fifths ; Fourth TOW是什么意思 tow years tow同音词 tow是什么? tow geese tow a