第三题两问图在题上面急
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第三题两问图在题上面急
![](http://img.wesiedu.com/upload/6/29/6296ba36bd51dd117d66fe4f767f8b4d.jpg)
![](http://img.wesiedu.com/upload/6/29/6296ba36bd51dd117d66fe4f767f8b4d.jpg)
![第三题两问图在题上面急](/uploads/image/z/14816047-31-7.jpg?t=%E7%AC%AC%E4%B8%89%E9%A2%98%E4%B8%A4%E9%97%AE%E5%9B%BE%E5%9C%A8%E9%A2%98%E4%B8%8A%E9%9D%A2%E6%80%A5)
1、
∠BMC=180-∠MCB-∠MBC
=180- (∠ACB+∠ABC)/2
=180- (180-∠A)/2
=180- (180-40)/2
=110
2、
∠BNC=180-∠NCB-∠NBC
=180- (外角C+外角B)/2
=180- (180-内角C+180-内角B)/2
=180- (360 - 180 +∠A)/2
=180- (180+40)/2
=70
若已解惑,请点右上角的 满意,谢谢
∠BMC=180-∠MCB-∠MBC
=180- (∠ACB+∠ABC)/2
=180- (180-∠A)/2
=180- (180-40)/2
=110
2、
∠BNC=180-∠NCB-∠NBC
=180- (外角C+外角B)/2
=180- (180-内角C+180-内角B)/2
=180- (360 - 180 +∠A)/2
=180- (180+40)/2
=70
若已解惑,请点右上角的 满意,谢谢