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\begin{array}{l}
\text { For any two numbers } \mathrm{a} \text { and } \mathrm{b} \text { , the operation } \# \text { is defined as follows: }\\
\#(a, b)=a \cdot(a+b)\\
\#(\#(2,0), 1)=?
\end{array}

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You are asked to find the value of the expression $\#(\#(2,0), 1)$, where $\mathrm{a}=\#(2,0)$ and $\mathrm{b}=1$.
According to the definition of the operation, $\#(\#(2,0), 1)=\#(2,0) \cdot \#(2,0)+1)$.
To calculate the value of the above expression, first calculate $\#(2,0)$.
According to the definition of the operation, $\#(2,0)=2 \cdot(2+0)=4$.
Substitute the value you have obtained for $\#(2,0)$ into the original expression and you will obtain $\#(\#(2,0), 1)=\#(4,1)$.
According to the definition of the operation, $\#(4,1)=4 \cdot(4+1)=20$.
by Diamond (79,336 points)

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