Question

Aduceti la forma cea mai simpla expresia: foto mai jos urgeeeent va rog

Answer 1

3.
  8√48-8√80+5√405-7√147=
=32√3-32√5+45√5-49√3=
=13√5-17√3

Answer 2

[tex] \sqrt{48}= \sqrt{16*3}=4 \sqrt{3} [/tex]
$\sqrt{80} = \sqrt{16*5}=4 \sqrt{5}$
$\sqrt{405}= \sqrt{81*5}=9 \sqrt{5}$
$\sqrt{147}= \sqrt{49*3}=7 \sqrt{3}$
 Din astea rezulta 
$8*4 \sqrt{3} -8*4 \sqrt{5} +5*9 \sqrt{5} -7*7 \sqrt{3} =13 \sqrt{5}-17 \sqrt{3}$