2. Упростить √50-√18+√72; 0,3√32+√18

1. $$√50 - √18 + √72 = √(25 \cdot 2) - √(9 \cdot 2) + √(36 \cdot 2) = 5√2 - 3√2 + 6√2 = (5 - 3 + 6)√2 = 8√2$$

2. $$0,3√32 + \frac{1}{3}√18 = 0,3√(16 \cdot 2) + \frac{1}{3}√(9 \cdot 2) = 0,3 \cdot 4√2 + \frac{1}{3} \cdot 3√2 = 1,2√2 + √2 = 2,2√2$$

Ответ: $$8√2; 2,2√2$$