Question

Найдите значение выражения

Answer 1

10*2=20

7*6*42=1764

1764 в корне это 42

20*42=840

Answer 2

$10 sqrt{7} times 2 sqrt{6} times sqrt{42} = 10 times 2 times sqrt{7} times sqrt{6} times sqrt{42} = 20 times sqrt{42} times sqrt{42} = \ \ = 20 times {( sqrt{42}) }^{2} = 20 times 42 = 840$