A:the teacher is not satisfied
B:is the teacher not satisfied
C:the teacher is satisfied
D:is the teacher satisfied
如图,在Rt△ABC中,∠B=90°,点O在边AB上,以点O为圆心,OA为半径的圆经过点C,过点C作直线MN,使∠BCM=2∠A.
解方程:2x+13-1=5x-16