a) 3/2+1/4+1/2=6/4+1/4+2/4=9/4.
b) [0,(4)+1/9]:5/3=(4/9+1/9):5/3=5/9·3/5=1/3.
c) 28/31·[1/4+(31/2+7/4):7/8=[1/4+(62/4+7/4):7/8=28/31·(1/4+69/4·8/7)=28/31·(1/4+138/7)=28/31·(7/28+552/28)=28/31·559/28=559/31.
La ultimul subpunct ai gresit undeva pentru ca mi se pare suspect rezultatul si mai ales acel "3 1/2". Intre 3 si 1/2 nu trebuia sa fie un semn? Inmultire? Adunare? Scadere?
