实数化简:
问题描述:
实数化简:
(1)7根号3-根号1/3
(2)根号40-5根号1/10+根号10
(3)(根号20+根号/根号5)-2
(4)根号12+根号27/根号3
(5)(根号3+根号2)×(根号3-根号2)
(6)根号1/7+根号28-根号700
(7)根号32-3根号1/2+根号2
答
(1)7根号3-根号(1/3)
=7根号3-根号3 /3
=21根号3/3-根号3 /3
=20根号3/3
(2)根号40-5根号1/10+根号10
=2根号10 -1/2根号10 +根号10
=5根号10/2
(3)(根号20+根号/根号5)-2 题不对
(4)根号12+根号27/根号3
=2根号3+3根号3/根号3
=2根号3+3
(5)(根号3+根号2)×(根号3-根号2)
=根号3的平方-根号2的平方
=1
(6)根号1/7+根号28-根号700
=根号7/7+2根号7-10根号7
=-55根号7/7
(7)根号32-3根号1/2+根号2
=4根号2 -3/2根号2 +根号2
=9/2根号2