Formula use: \left(a-b\right)^3=a^3-b^3-3.a.b.\left(a-b\right)

Explanation

Here, given expression is :
3.25\times3.25\times3.25\ –\ 2.25×2.25×2.25\ –\ 3×3.25×2.25
Let,
3.35 = a
2.25 = b
Now,
\left(a-b\right)
\rightarrow\left(3.35-2.25\right)
\therefore 1
Now, find the value :
3.25\times3.25\times3.25\ –\ 2.25×2.25×2.25\ –\ 3×3.25×2.25
\rightarrow\left(3.25\right)^3-\left(2.25\right)^3-3\times1\times3.25\times2.25
\rightarrow a^3-b^3-3.a.b.\left(a-b\right)
\rightarrow\left(a-b\right)^3
\rightarrow\left(1\right)^3
\therefore 1
Ans: 1.