Răspuns :

GreenEyes71id

Salut,

[tex]\sqrt{63}\cdot(-\sqrt7)}=\sqrt{9\cdot 7}\cdot(-\sqrt7)}=\sqrt{3^2\cdot 7}\cdot(-\sqrt7)}=\\\\=\sqrt{3^2}\cdot\sqrt7\cdot(-\sqrt7)}=-3\cdot(\sqrt7)^2=-3\cdot 7=-21.[/tex]

Ai înțeles ?

Green eyes.

√63×(-√7)=

=3√7×(-√7)=

=3×(-7)= -21

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