Răspuns :
11+12+13+....+500=(1+2+3+...+500)-(1+2+3+....+10)=500×501:2-10×11:2=125250-55=125195
11 + 12 + ... + 500 =
= [(1 + 2 + .. + 10) + 11 + 12 + .. + 500] - (1 + 2 + .. + 10)
= 500x501 : 2 - 10x11 : 2
= 125250 - 55
= 125195
11+12+13+....+500=(1+2+3+...+500)-(1+2+3+....+10)=500×501:2-10×11:2=125250-55=125195
11 + 12 + ... + 500 =
= [(1 + 2 + .. + 10) + 11 + 12 + .. + 500] - (1 + 2 + .. + 10)
= 500x501 : 2 - 10x11 : 2
= 125250 - 55
= 125195