Question

Cum se rezolva :1+2+3+...+10+x=3000

Answer 1

1+2+3+...+10 este suma Gauss si este egala cu 55
55+x=3000
x=3000-55
x=2945

Answer 2

1+2+3+...+10+x = 3000
(1+10)+(2+9)+(3+8)+(4+7)+(5+6)+ x =3000
11+11+11+11+11+x = 3000
55+x = 3000
x = 3000 -55
x = 2945