Question

va rog ajutati-ma la exercițiul 8.Chiar nu stiu cum sa il fac ;-;​

Answer 1

Salut,

$\dfrac{5+10+15+\ldots+525}{3+6+9+\ldots+315}=\\\\=\dfrac{5\cdot 1+5\cdot 2+5\cdot 3+\ldots+5\cdot 105}{3\cdot 1+3\cdot 2+3\cdot 3+\ldots+3\cdot 105}=\\\\=\dfrac{5\cdot (1+2+\ldots+105)}{3\cdot (1+2+\ldots+105)}=\dfrac{5}{3}.$

Green eyes.