Question

Punctul c...
Va roggg

Answer 1

Obs ; vom tine cont ca 5=√5 *√5
si ca 15=3*5=3*√5*√5
 si ca 10=2*5=2*√5*√5
de asemenea
√20=√(4*5)=√4 *√5=2√5
√45=√(9*5)=√98√5=3√5
atunci suma devine

15/2√5 +10/3√5+√5+5/√5=
(3√5)/2 +(2√5)/3+√5+√5=
√5 (3/2+2/3 +1+1)=
√5 (9/6+4/6+6/6+6/6)=
√5(25/6)=(25√5)/6