Question

(+3 supra 4)-(+2 supra 3)

Answer 1

=(3x3x3x3)-(2x2x2)=81-8=73

Answer 2

$\displaystyle \frac{3}{4} - \frac{2}{3} = \frac{3 \cdot 3}{4 \cdot 3} - \frac{2 \cdot 4}{3 \cdot 4} = \frac{9}{12} - \frac{8}{12} = \frac{1}{12}$