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8 , b c .
Va rog frumoooooooooooos :3


8 B C Va Rog Frumoooooooooooos 3 class=

Răspuns :

b)3√10(√2-2√5)-2√10*(4√2-7√5)=
3√20-6√50-8√20+14√50=
6√5-30√2-16√5+70√2=-10√5+40√2=-10(√5-4√2)
c)3√15*(3√3-8√5)-√15*(4√5-13√3)=
  9√45-24√75-4√75+13√45=
  27√5-120√3-20√3+39√5=64√5-140√3=4(16√5-35√3)