Răspunsuri

2014-02-09T11:50:26+02:00
A-b=b
a=2b
a+b=c si inlocuim
2b+b=c
c=3b
b+c=20
b+3b=20
4b=20  b=5  a=10  c=15
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2014-02-09T11:55:20+02:00
A+b=c⇒2b+b=c⇒3b=c
a-b=b⇒a=2b
b+c=20⇒b+3b=20⇒4b=20

b=20:4
b=5

a=2 x 5
a=10

c=3 x 5
c=15


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