mohon dibantu dg cara ya

a) 3/√2
= 3/√2  x √2/√2
= 3√2/2

b) √(3/5)
= √3/√5 x √5/√5
= √15/5

c) -6/√7
= -6/√7 x √7/√7
= -6√7/7

d) 3-√6/3+√6
= 3-√6/3+√6 x 3-√6/3-√6
= 9 - 3√6 - 3√6 + 6 / 9 - 3√6 + 3√6 - 6
= 15 - 6√6 / 3
= 5 - 2√6

e) 1/√3+√7
= 1/√3+√7 x √3-√7/√3-√7
= √3-√7/ 3 - √21 + √21 - 7
= √3-√7/-4