Giải bài 1 chi tiết ạ

`a) 11 . 13 + 11. 37 = 11 . (13 + 37) = 11 . 50 = 550`

`b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70`

` = 70 . 35 + 70 . 25 + 70 . 20`

` = 70 . (35 + 25 + 20)`

` = 70 . 90`

` = 6300`

`c) 53 . (51 + 4) + 53 . (49 + 96) + 53`

` = 53 . (51 + 4 + 49 + 96) + 53`

` = 53 . 200 + 53`

` = 10600 + 53 = 10653`

`d) 15 . 37 . 4 + 120 . 21 + 21 . 5 . 12`

` = 15 . 4 . 37 + 15 . 4 . 2 . 21 + 12 . 5 . 21`

` = 60 . 37 + 60 . 2 . 21 + 60 . 21`

` = 60 . (37 + 2 . 21 + 21)`

` = 60 . 100`

` = 6000`

`e) 25 . 5 . 4 . 27 . 2`

` = (25 . 4) . (5 . 2) . 27`

` = 100 . 10 . 27`

` = 1000 . 27 = 27000`

`f) 16. (27 + 75) + 8 . (53 + 25) . 2`

` = 16 . (27 + 75) + 16 . (53 + 25)`

` = 16 . (27 + 75 + 53 + 25)`

` = 16 . 180`

` = 2880`