①x﹣ 13 =0.25
② 15 x﹣ 13 =120
③ x3 =50%
如图,△AOB中,∠AOB=90°,AO=2,BO=4,△AOB绕顶点O逆时针旋转到△A′OB′处,此时线段A′B′与BO的交点E为BO的中点,则线段B′E的长度为____
—I feel a little nervous ____ the exam . —______. All of the students may feel nervous.