50^2+51^2+52^2+……+100^2

　　解：原式=(1^2+2^2+3^2+……+100^2)-(1^2+2^2+3^2+……+49^2) =100×(100+1)×(2×100+1)÷6-49×(49+1)×(2×49+1)÷6 =338350-40425 =297925