Question

Answer 1

a: \(P=\left(369-219\right)\cdot\left(369^2+369\cdot219+219^2\right)\)

\(=150\cdot9\cdot A=1350\cdot A⋮1350\)

b: Đề sai rồi bạn

 

Answer 2

Không đăng lại.

Answer 3

`369^3-219^3`

`=(3.123)^3-(3.73)^3`

`=3^3 . 123^3-3^3 . 73^3`

`=3^3(123^3 - 73^3)`

`=27(123-73)(123^2 - 123.73+73^2)`

`=27.50(123^3 +123.73+73^2)`

`=1350(123^3 +123.73+73^2)` ⋮ `1350` (đpcm)