a/0,8 = b/ 4/5 = c/ 6/5c-28,2 = a-------------------------a/0,8 = a/ 8/10 = a/ 4/5 = 5a/4 = 5c/6 ⇔ a/2=c/3, dupa simplificari prin 5 si 2⇒ a=2c/3 si introducem pe a de aici in c-28,2 = a:c-28,2 = 2c/3, aducem la acelas numitor, 33c - 2c = 28,2 *3c= 84,6 haa=2/3 *846/10 = 282*2/10= 564/10 = 56,4 ha
b= 4c/5 * 5/6 = 4c/6=2c/3=2*846 / 10*3 = 282/5 = 56,4 ha
Succes in continuare!