If the ratio of the degree of exterior angle of ∠A,∠B and ∠C
that are in the triangle ABC is 5:4:3,then the ratio of the degree
of ∠A,∠B and ∠C is ( )
A、5:4:3 B、3:4:5 C、1:2:3 D3:2:1
七年级数学选择题困难题
If the ratio of the degree of exterior angle of ∠A,∠B and ∠C
that are in the triangle ABC is 5:4:3,then the ratio of the degree
of ∠A,∠B and ∠C is ( )
A、5:4:3 B、3:4:5 C、1:2:3 D3:2:1
七年级数学选择题困难题查看答案及解析
In right Fig.,if the length of the segment AB is 1,M is the midpoint
of the segment AB,and point C divides the segment MB into two parts
such that MC:CB=1:2,then the length of AC is ________。
(英汉词典:length 长度;segment 线段;midpoint 中点;divides…into 分为,分成)
七年级数学选择题困难题查看答案及解析
The average number of p,q,r is 4,and average number of p,q,r,x is﹣2,then x =________.
(英文词典:average number平均数)
七年级数学选择题简单题查看答案及解析
If ,then ( )
A、 B、
C、 D、
七年级数学选择题困难题查看答案及解析
If m=2,then = ( )
(A) -2 (B) -1 (C) 1 (D) 2 。
七年级数学选择题困难题查看答案及解析
如图,已知射线AB与直线CD交于点O,OF平分∠BOC,OG⊥OF于点O,AE∥OF,且∠A=30°.
(1)求∠DOF的度数;
(2)试说明OD平分∠AOG.
七年级数学解答题简单题查看答案及解析
如图,已知射线AB与直线CD交于点O,OF平分∠BOC,OG⊥OF于点O,∠DOF+∠A =180°.
(1)求证:AE//OF
(2)若∠A=30°,求证:OD平分∠AOG.
七年级数学解答题中等难度题查看答案及解析
如图所示,∠EOF=60°,PA∥OF,PB∥OE,PC⊥OF于点C,求∠BPC的度数.
七年级数学解答题简单题查看答案及解析
如图所示,∠EOF=60°,PA∥OF,PB∥OE,PC⊥OF于点C,求∠BPC的度数.
七年级数学解答题简单题查看答案及解析
如图,已知直线BC、DE交于O点,OA、OF为射线,OA⊥BC,OF平分∠COE,∠COF=17°.求∠AOD的度数.
七年级数学解答题中等难度题查看答案及解析