Question

[-7radical 14÷ (- radical 2)-radical28+radical63 înmulțit (2-radical7)]

Answer 1

Răspuns:

$( - 7 \sqrt{14} \div ( - \sqrt{2)} - \sqrt{28} + \sqrt{63} \times (2 - \sqrt{7)}$

$= (7 \sqrt{7} - \sqrt{28} + \sqrt{63} \times (2 - \sqrt{7} )$

$= 7 \sqrt{7} - 2 \sqrt{7} + 3 \sqrt{7} \times (2 - \sqrt{7} )$

$= 7 \sqrt{7} - 2 \sqrt{7} + 6 \sqrt{7} - 21$

$= 11 \sqrt{7} - 21$