Question

Efectuând √ 2 · √ 3 + √ 42 : √ 7 -√ 54 , se obține:
A. -√ 6B. -2√ 6C. -3√ 6D. √ 6

Answer 1

$\sqrt{2} \times \sqrt{3} + \sqrt{42} \div \sqrt{7} - \sqrt{54} = \sqrt{6} + \sqrt{6} - 3 \sqrt{6} = - \sqrt{6}$

Answer 2

√2 · √3 + √42 : √7 - √54 =

√6 + √6 - 3√6 =

2√6 - 3√6 = -√6.

@robertinnifd