sqrt (2) C. sqrt (3) D.2
-2-|||-D.2
已知点A(1,2),B(a,3), |AB|=sqrt (10),则A(1,2),B(a,3), |AB|=sqrt (10).A.-2 B.4 C.-2或4
(1+e)-|||-D.2
[ -sqrt (2),sqrt (2)] D. [ -sqrt (2),0]
-1 . C.0 D.2
sqrt (2)-|||-C. sqrt (34)-|||-○ D. sqrt (2)
[ sqrt (3),2] -|||-C. [ -2,-sqrt (3)] D. [ -2,-sqrt (3)] cup [ sqrt (3),2]
sqrt (2)pi :2 C. sqrt (2)pi :4 D. sqrt (2)pi :8