[紧急]一道初一数学几何题如图,∠CAD=3∠BAD ,∠ABE=3∠CBE ,∠BCF=3∠ACF
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解决时间 2021-02-08 14:08
- 提问者网友:留有余香
- 2021-02-07 23:11
[紧急]一道初一数学几何题如图,∠CAD=3∠BAD ,∠ABE=3∠CBE ,∠BCF=3∠ACF
最佳答案
- 五星知识达人网友:迷人又混蛋
- 2021-02-08 00:35
∠BMF= ∠BCF+∠CBE = 2∠CND = 2(∠CAD+∠ACF)即得出∠BCF+∠CBE = 2(∠CAD+∠ACF)而∠BCF = 3∠ACB /4 (即4分之3大小的∠ACB)∠CBE = ∠ABC /4∠CAD = 3∠BAC /4 ∠ACF = ∠ACB /4由上可得出3∠ACB /4 + ∠ABC /...======以下答案可供参考======供参考答案1:∵∠BMF=1/4∠ABC+3/4∠BCA,∠CND=3/4∠BAC+1/4∠BCA,∠BMF=2∠CND ∴1/4∠ABC+3/4∠BCA=2(3/4∠BAC+1/4∠BCA)∴∠ABC+3∠BCA=6∠BAC+2∠BCA∴∠ABC+∠BCA=6∠BAC又∵∠ABC+∠BCA+∠BAC=180°∴7∠BAC=180°∴∠BAC=180°/7供参考答案2:简单啊!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!∵∠BMF=1/4∠ABC+3/4∠BCA,∠CND=3/4∠BAC+1/4∠BCA,∠BMF=2∠CND ∴1/4∠ABC+3/4∠BCA=2(3/4∠BAC+1/4∠BCA) ∴∠ABC+3∠BCA=6∠BAC+2∠BCA ∴∠ABC+∠BCA=6∠BAC 又∵∠ABC+∠BCA+∠BAC=180° ∴7∠BAC=180°∴∠BAC=180°/7 =25.5度
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- 1楼网友:玩世
- 2021-02-08 01:19
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