Simplify.
\[
\frac{5^{2}+2^{2}-1^{2}}{8 \div 2 \cdot 9 \cdot 1 \div 9}
\]
Select the correct choice below and, if necessary, fill in the answer box to complete your choic
A. $\frac{5^{2}+2^{2}-1^{2}}{8 \div 2 \cdot 9 \cdot 1 \div 9}=$
B. The expression is undefined.

Answer

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Answer

Final Answer: $\boxed{7}$

Steps

Step 1 ：Simplify the numerator: $5^{2}+2^{2}-1^{2} = 25+4-1 = 28$

Step 2 ：Simplify the denominator: $8 \div 2 \cdot 9 \cdot 1 \div 9 = 4 \cdot 9 \cdot 1 \div 9 = 4$

Step 3 ：Divide the numerator by the denominator: $\frac{28}{4} = 7$

Step 4 ：Final Answer: $\boxed{7}$