Question

Помогите с дз по алгебре

Answer 1

$1) 18 *(frac{1}{9})^{2}- 20 * frac{1}{9} = 18* frac{1}{9} - 20 = frac{18}{1} * frac{1}{9} - 20= frac{18}{9} -20$ = 2-20= -18
2) 3
3)