Giúp mình bài 6 với ạ ko cần làm bài 7.

Bài `6`

`a,` 

`2025 . 27 + 73 . 2025`

`= 2025 . (27+73)`

`= 2025 . 100`

`= 202500`

`b,`

`5.11.18 + 9.31.10 + 4.29.45`

`= 5.11.2.9 + 9.31.2.5 + 2.2.29.9.5`

`= 2.5.9 . (11 + 31 + 58)`

`= 90 . 100`

`= 9000`

`c,`

`216.49 + 50.216 + 216`

`= 216 . (49+50+1)`

`= 216 . 100`

`= 21600`

`d,`

`37.39 + 78.14 + 13.85 + 52.55`

`= 37.39 + 39.2.14 + 13.85 + 13.4.55`

`= 39.(37+28) + 13.(85 + 220)`

`= 39 . 65 + 13 . 305`

`= 13.3 . 65 + 13 . 305`

`= 13 . (195 + 305)`

`= 13 . 500`

`= 6500`

#Yoshimoto Shizuka