配套习题- 巧用代数法探究角之间的数量关系（1） -【青果学院】

1/5单选题

难度：

1.如图，在△ABC中，∠ABC的平分线与∠ACB的外角平分线相交于D点，∠A=50°，则∠D=（　　）

A	15°
B	20°
C	25°
D	30°

正确答案：Qw==

6Kej77ya5qC55o2u6KeG6aKR5Lit5L6L6aKY55qE6K6y6Kej77yM5Y+v5b+r6YCf5b6X5Ye6PGltZyB3aWR0aD0xMDIgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRUUvREIvckJBQ0ZGTmdiS2lqUEtNYUFBQUNVRlNLYXRzODcyLnBuZyI+PGJyPg==

2/5单选题

难度：

2.如图所示，在△ABC中，∠ABC和∠ACB的外角平分线交于点O，设∠BOC=α，则∠A等于（　　）

A
B
C
D

正确答案：Qw==

6Kej77ya5qC55o2u5L6L6aKY55qE6K6y6Kej77yM6K++5b+r6YCf5b6X5Ye6PGltZyB3aWR0aD0zMjkgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMkEvRTgvckJBQ0UxTmdiWEhCd2RGREFBQUVQSTNBZURVMjkxLnBuZyI+

3/5单选题

难度：

3.如图，△ABC的角平分线BO、CO相交于点O，∠A=120°，则∠BOC=（　　）

A	150°
B	140°
C	130°
D	120°

正确答案：QQ==

6Kej77ya5qC55o2u6KeG6aKR5Lit5L6L6aKY6K6y6Kej55qE5qih5Z6L77yM5Y+v5b+r6YCf5b6X5Ye6PGltZyB3aWR0aD0yMjMgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMkEvRTkvckJBQ0UxTmdiWC1nejN3QUFBQURhREctNU5jOTI2LnBuZyI+

4/5单选题

难度：

4.如图，△ABC的角平分线BO、CO相交于点O，∠O=140°，则∠A=（　　）

A	160°
B	140°
C	120°
D	100°

正确答案：RA==

6Kej77ya5qC55o2u6KeG6aKR5Lit5L6L6aKY6K6y6Kej55qE5qih5Z6L77yMPGJyPuWPr+W/q+mAn+W+l+WHujxpbWcgd2lkdGg9Mjk2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0VFL0U0L3JCQUNGRk5nYm1pZ0lJWFFBQUFFSjdrVnplMDk4MS5wbmciPg==

5/5单选题

难度：

5.如图，

分别是△ABC的内角平分线和外角平分线，

的角平分线

的角平分线，

的角平分线，若

A
B
C
D

正确答案：Qg==

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