Question

$18* (frac{1}{9})^{2} -20 * frac{1}{9}$

Answer 1

$18*( frac{1}{9})^2-20*frac{1}{9}=frac{1}{9}(18*frac{1}{9}-20)=frac{1}{9}(2-20)=-frac{1}{9}*18=-2$