化简512得（）A.52B.156C.523D.56

Question

化简

√((5)/(12))得（　　）

A.

(√(5))/(2)

B.

(√(15))/(6)

C.

(√(5))/(2√(3))

D.

(√(5))/(6)

化简

√((5)/(12))得（　　）

化简√((5)/(12))得（　　）√((5)/(12))得（　　）√((5)/(12))

(5)/(12)

(5)/(12)

(5)/(12)(5)/(12)512551212

A.

(√(5))/(2)

(√(5))/(2)(√(5))/(2)√(5)2√(5)√(5)√(5)

5

5

522

B.

(√(15))/(6)

(√(15))/(6)(√(15))/(6)√(15)6√(15)√(15)√(15)

15

15

1566

C.

(√(5))/(2√(3))

(√(5))/(2√(3))(√(5))/(2√(3))√(5)2√(3)√(5)√(5)√(5)

5

5

52√(3)2√(3)√(3)

3

3

3

D.

(√(5))/(6)

(√(5))/(6)(√(5))/(6)√(5)6√(5)√(5)√(5)

5

5

566

Answer 1

原式=√((5×3)/(12×3))
=(√(15))/(6)．
故选B． √((5×3)/(12×3))

(5×3)/(12×3)

(5×3)/(12×3)

(5×3)/(12×3)(5×3)/(12×3)5×312×35×35×35×312×312×312×3
=(√(15))/(6)．
故选B． (√(15))/(6)√(15)6√(15)√(15)√(15)

15

15

1515666．
故选B．