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a= √2
r = 1
S~ = a/ ( 1 - r)= √2/(1-1) = √2 / (0) = ~
3)
p = √(54+14√5) = √(54 + 2√245) = √(√49 +√5)² = √49+√5 = 7 + √5
q = √(12 - 2√35) = √( √7 -√5)² = √7 - √5
r = √(32 - 10√7) = √(32 -2√175) = √(√25 - √7)² = √25 -√7 = 5 -√7
p + q + r = 7 +√5 +√7 - √5 + 5 - √7
p + q + r = 7 + 5 = 12