Răspunsuri

2014-03-26T22:14:09+02:00
(a+b) x 7=(a+b) +360
1/4 x a=1/2 x b, deci a= 4/2 X b=2 x b a=2 x b
il inlocuim pe a in prima ecuatie si obtinem:
(2 x b + b) X 7= (2 x b + b) +360
3 x b x 7=3 x b + 360
21 x b= 3 x b +360
18 x b=360
b=20
a=2 x b= 2 x 20=40
a=40