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1) rational number
2) 1/3 = 0.33
4) (√2 - √3)(√2 +√3) = (√2)^2 - (√3)^2
=4 - 9
= -5
5) 8√3 -2√3 +4√3 = (8 -2 +4)√3
= 10√3
6) the rationalising factor of 2+√3 = 2 -√3
7) 3√100 = 3× 10 = 30
8) √2 -1 = 0.44
9) a-b√15
4 -(-2)√15
therefore ,b =-2
10) (b+a) = -8
(a+b)^3 = -512
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