(2×+1)+(2×+2)+(2×+3)+....+(2a+100)=5650​

Răspuns :

Explicație pas cu pas:

(2×+1)+(2×+2)+(2×+3)+....+(2a+100)=5650

2a×100+1+2+3+.. +100=5650

200a+100×101/2=5650

200a+50×101=5650

200a=5650-5050

200a=600

a=3