Question

Ajutati-ma! 
$(12 \frac{5}{12} +1 \frac{2}{3} -3 \frac{5}{6}+2 \frac{3}{4} ):(2 \frac{1}{2}.\frac{2}{5}- \frac{7}{9})=?$
la raspunsuri scre ca rezultatul trebuie sa fie $2 \frac{8}{9}$

Answer 1

(12 5/12+ 1 2/3 -3 5/6 + 2 3/4) :( 2 1/2 x 2/5 -7/9)=
=(149/12+ 5/3 -23/6 + 11/4) :( 5/2 x 2/5 -7/9)=
=(149+20-46+33)/12  x (1 -7/9)= 156/12x2/9) = 13 x2/9=26/9=2 8/9