5√18-4√8+7√32-9√50=?

Răspuns :

5*3√2-4*2√2+7*4√2-9*5√2=
=15√2-8√2+28√2-45√2=
=-10√2
5√18-4√8+7√32-9√50=
= 5×3√2-4×2√2+7×4√2-9×5√2
= 15√2-8√2+28√2-45√2=
= -10√2