\(\dfrac{7}{10^2+6\cdot10^2}=\dfrac{7}{100+6\cdot100}=\dfrac{7}{100+600}=\dfrac{7}{700}=\dfrac{1}{100}\)
\(=\dfrac{7}{10^2.\left(6+1\right)}=\dfrac{7}{100.7}=\dfrac{7}{700}=\dfrac{1}{100}\)
\(\dfrac{7}{10^2+6.10^2}\)=\(\dfrac{7}{100+6.100}=\dfrac{7}{700}=\dfrac{1}{100}\)