([tex] \frac{1}{2} [/tex]v7)*(-[tex] \frac{2}{3} [/tex]V7

Răspuns :

1/2√7×(-2/3)√7=
1/2×(-2/3)√7×√7=
-1/3×7=
-7/3
(1/2√7)*(-2/3√7) =
= √7/2 *(-2√7/3 ) =
= -√7*√7/3 = 
= -7/3