Question

ajutatima la matematica clasa a V, 3+6+9+12.....+3000

Answer 1

S=3+6+..+3000
S= 3 ×(1+2+3+...+1000)
S= 3×$\frac{1000*1001}{2}$
S= 3 ×$\frac{1001000}{2}$
S= 3 ×500500
S= 1501500

Answer 2

3(1+2+3+4+...1000)=3x(1000x1001):2=3003000:2=15015000