Question

afla valoare lui y-(1+2+3...+48)=3520

Answer 1

1+2+3+y+48=3 520

1+2=3+3=6+48=54

3 520-54=3 466

V: 1+2+3+3 466+48=3 520

                                                                                 R: 3 520 este y

Answer 2

Prima oara calculam paranteza (Teoria lui Gauss)

1+2+3...+48=48×(48+1):2
=48×49:2
=2352:2
=1176

y-1176=3520
y=3520+1176
y=4696