ex 11 pls dau coroana.

Ex 11 Pls Dau Coroana class=

Răspuns :

2(1+2+...+100)=2×100×101÷2=100×101
2×(1+2+3+...+100)
S2=2×(2+1):2
S2=2×3:2
S2=1×3
S2=3