Algo and Math

(-5)^2-4^2+6^0 /3^(-2) +1

(-5)^2 = 25 ?

{(-5)²-4²+6⁰}/{3-²+1}=??
={25-16+1}/{1/9+1}
={25+1-16}/{(1+9)/9}
={26-16}/{10/9}
=10/(10/9)
=10×9/10
=90/10
=9
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