Răspunsuri

2014-11-19T14:09:08+02:00
A+b+c+d=210
b=50+a
c=a-5
d=a+85
inlocuim b,c,d
a+50+a+a-5+a+85=210
4a+130=210
4a-80
a=20
b=50+20=70
c=20-5=15
d=20+85=105

2014-11-19T14:10:30+02:00
a+b+c+d=210 b=a+50 c=a-5 d=a+85 a+a+50+a-5+a+85=210 4a+130=210 4a=210-130 4a=80 a=80:4 a=20 b=70 c=15 d=105