11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100 31/08/2021 Bởi Quinn 11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100 = 11 + 2 x 11 + 3 x 11 +….+ 8 x 11 + (99 x 100) = 11 x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8) + (99 x 100) = 11 x 36 + 99 x 100 = 396 + 9900 = 10296 Bình luận
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100 = 11 + 11 x 2 + 11 x 3 + 11 x 4 + 11 x 5 + 11 x 6 + 11 x 7 + 11 x 8 + 11 x 9 x 100 = 11 x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 x 100) = 11 x (45 + 900) = 11 x 945 = 10395 Bình luận
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100
= 11 + 2 x 11 + 3 x 11 +….+ 8 x 11 + (99 x 100)
= 11 x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8) + (99 x 100)
= 11 x 36 + 99 x 100
= 396 + 9900
= 10296
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 x 100
= 11 + 11 x 2 + 11 x 3 + 11 x 4 + 11 x 5 + 11 x 6 + 11 x 7 + 11 x 8 + 11 x 9 x 100
= 11 x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 x 100)
= 11 x (45 + 900)
= 11 x 945
= 10395