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2√500 + 3√75 = 2√100 × √5 + 3√25 × √3 = 20√5 + 15√3
b)
7√27-2√243-5√3 = 7√9×√3 - 2√81×√3 - 5√3 = 21√3 - 18√3 - 5√3 = -2√3
c)
(√2+2√7)^2-4√14+2√18:√2 = 2 + 4√14 + 28 - 4√14 +2√9×√2 ÷ √2 =
= 30 + 6√2 ÷ √2 = 30 + 6 = 36