Question

vreau si eu radpuns la a+a=12,b+b=10,c+c=8,atunci ab-bc=?​

Answer 1

Răspuns:

a=6

b=5

c=4

ab-bc = 6x5-5x4 = 30-20 = 10

Answer 2

2a=12=>a=12:2=>a=6

2b=10=>b=10:2=>b=5

2c=8=>c=8:2=>c=4

ab-bc=6*5-5*4=30-20=>ab-bc=10