Question

1) daca a-b=27 si c=30 calculati ac-cb
2) daca a+b=40 si b+c=60 calculati 2a+3b+c

Answer 1

1) ac - cb= c(a-b)= 30 x 27= 810
2) a+b= 40 => a= 40-b
b+c= 60 => c= 60-b
2a+3b+c = 2(40-b) + 3b + (6-b)=80-2b+3b + 6 - b=86