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√72 + 3√32 - 5√18 = √(36 * 2) + 3√(16 * 2) - 5√(9 * 2) =
= 6√2 + 3 * 4√2 - 5 * 3√2 = 6√2 + 12√2 - 15√2 = 18√2 - 15√2 = 3√2
zad 1 (załącznik 2)
2√27 - 4√48 + √75 = 2√(9 * 3) - 4√(16 * 3) + √(25 *3) =
= 2 * 3√3 - 4 * 4√3 + 5√3 = 6√3 - 16√3 + 5√3 = 11√3 - 16√3 = - 5√3