Question

$\sqrt{63\\}$ + 4$\sqrt{28}$ - 5$\sqrt{7\\}$

Answer 1

Объяснение:

$\sqrt{63} + 4 \sqrt{28} - 5 \sqrt{7} = \sqrt{9 \times 7} + 4 \sqrt{4 \times 7} - 5 \sqrt{7}$

$3 \sqrt{7} + 4 \times 2 \sqrt{7} - 5 \sqrt{7} = 3 \sqrt{7} + 8 \sqrt{7} - 5 \sqrt{7} = 6 \sqrt{7}$