г) √54 - √24 + √150; д) 3√2 + √32 - √200; e) 2√72 - √50 - 2√8.

г) $$√{54} - √{24} + √{150} = √(9 \cdot 6) - √(4 \cdot 6) + √(25 \cdot 6) = 3√6 - 2√6 + 5√6 = (3 - 2 + 5)√6 = 6√6$$

Ответ: $$6√6$$

д) $$3√2 + √{32} - √{200} = 3√2 + √(16 \cdot 2) - √(100 \cdot 2) = 3√2 + 4√2 - 10√2 = (3 + 4 - 10)√2 = -3√2$$

Ответ: $$-3√2$$

e) $$2√{72} - √{50} - 2√8 = 2√(36 \cdot 2) - √(25 \cdot 2) - 2√(4 \cdot 2) = 2 \cdot 6√2 - 5√2 - 2 \cdot 2√2 = 12√2 - 5√2 - 4√2 = (12 - 5 - 4)√2 = 3√2$$

Ответ: $$3√2$$