MA AJUTA-TI VA ROG !! DAU COROANA !! VA ROOG E URGENT!

Răspuns:
a) = 35/4-25/4=(10/4)⁽²=5/2
b) a+6/9=20/9=>a=20/9-6/9=>a=14/9
b-26/3=14/3=>b=14/3+26/3=>b=40/3
80/10-c=26/10=>c=80/10-26/10=>c=54/10
30/5+d=98/5=>d=98/5-30/5=>d=68/5
c) 50% din 10000=50·10000:100=5000
75% din 4500=75·4500:100=3375