$A=n\left[n^2{\left(n^2-7\right)}^2-36\right]=n\left[{\left(n^3-7n\right)}^2-36\right]$

$=n\left(n^3-7n-6\right)\left(n^3-7n+6\right)$

$=n\left(n-3\right)\left(n+1\right)\left(n+2\right)\left(n-2\right)\left(n-1\right)\left(n+3\right)$

$\Rightarrow A$ là tích 7 số nguyên liên tiếp nên A luôn chia hết cho 7

A = [ n³(n²-7)²-36n ] ⋮ 7 với ∀n ϵ Z

 Those are their house and this is my house

36.33-105.11+22.15

=1188-1155+330

=33+330

=363

1m2dm=1,2m