Ta có: 12 + 22 + 32 + ..... + 992 + 1002 = 338350
=> 22.(12 + 22 + 32 + ..... + 992 + 1002) = 22 . 338350
=> 22 + 42 + 62 +.....+ 1982 + 2002 = 4.338350
=> 22 + 42 + 62 +.....+ 1982 + 2002 = 1 353 400
Ta có: 12 + 22 + 32 + ..... + 992 + 1002 = 338350
=> 22.(12 + 22 + 32 + ..... + 992 + 1002) = 22 . 338350
=> 22 + 42 + 62 +.....+ 1982 + 2002 = 4.338350
=> 22 + 42 + 62 +.....+ 1982 + 2002 = 1 353 400