Question

помогите упростить задачи

Answer 1

$a)3 \sqrt{2} + \sqrt{8} - \sqrt{32} = 3 \sqrt{2} + 2 \sqrt{2} - 2 {}^{2} \sqrt{2} = 3 \sqrt{2} + 2 \sqrt{2} - 4 \sqrt{2} = \sqrt{2}$

$b)12 \sqrt{5} - 3 \times (4 \sqrt{5} - \sqrt{25} ) = 12 \sqrt{5} - 3(4 \sqrt{5} - 5) = 12 \sqrt{5} - 12 \sqrt{5} + 15 = 15$

$в)4 \sqrt{7} \times ( \sqrt{7} - \sqrt{ \frac{1}{7} }) = 28 - 4 \sqrt{ \frac{7}{7} } = 28 - 4 \sqrt{1} = 28 - 4 \times 1 = 28 - 4 = 24$