Răspuns:
1.
4/√8 - 6/√2 + 2√5/√10 +(1/√18)^(-1) = 4/(2√2) - 6/√2 +2√5/(√2√5) + √18 =
2/√2 - 6/√2 + 2/√2 + 3√2 = (2√2 - 6√2 +2√2 + 6)/2 = (6 - 2√2)/2 = (3-√2)/2
2.
√6(5/√2 - 3/√3) - √3(2 - √6) = √6(5√3 - 3√2)/√6 -2√3 + √18 =
5√3 - 3√2 -2√3 + 3√2 = 3√3
3.
BC² = CD² - AB² => BC² = 100 - 64 = 36 => BC = 6
Aria = AB x BC = 8x6 = 48
