a)\(99^2=\left(100-1\right)^2=100^2-2.100.1+1^2=10000-200+1=9801\)
b)\(79^2+24^2-48.79=\left(24+79\right)^2=\left(103\right)^2=\left(100+3\right)^2=100^2+600+9\)
\(=10609\)
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