Răspuns:
1 rand
b= -1 , a+b=1/2 ,b+c= -1,2, a-(b+c)=2,7 ,-a+(b+c)=-2,7
2 rand
C=13,8(3) , a=54,2 ,a+b=52,8(7) ,a-b=55,5(3) , -a+(b+c)= -41,7
3 rand
