3. ds,已知一个圆,圆上的三个点和圆心组成一个四边形OABC,问和圆心对着的那个角B的度数? (1)已知圆心的那个角即AOC是70度 (2)已知OAC是55度 我觉得答案应是 A,延长BO交圆于E,则角AEC=35,因为EB是直径,角EAB&角ECB都是90,那角B就是180-35=145. 请问答案是 E orD 是怎么求出来?
for (1)together with (2) four positive number obviously satisfy the (1)and (2) and make the original function bigger than 0.but if u use these numbers 1,-1,2,3for m,s,t,p each,though they also satisfy function(1)and (2),u will find the original function is smaller than 0 .so (1) together with (2) still can't get the answer
for (1)together with (2) four positive number obviously satisfy the (1)and (2) and make the original function bigger than 0.but if u use these numbers 1,-1,2,3for m,s,t,p each,though they also satisfy function(1)and (2),u will find the original function is smaller than 0 .so (1) together with (2) still can't get the answer