Question

$15 \sqrt{7} + 3 \times acolada \: - 4 \sqrt{3} + 5 \times paranteza \: patrata \: 2 \sqrt{7} + 3 \times (3 \sqrt{3} - 7) \: toate \: parantezele \: inchise$
urgent!!!!! dau coroana​

Answer 1

Răspuns:

= 45√7 +123√3 -315 = 3·(15√7 +41√3 -105)

Explicație pas cu pas:

15√7 +3·{-4√3+5·[2√7+3·(3√3 -7)]}   = ?

15√7 +3·{-4√3+5·[2√7+3·(3√3 -7)]}   = 15√7 +3·{-4√3+5·[2√7+9√3 -21]} =

= 15√7 +3·(-4√3+10√7+45√3-105) = 15√7 +3·(41√3 +10√7 -105)=

=15√7 +123√3+30√7 - 315 = 45√7 +123√3 -315 = 3·(15√7 +41√3 -105)