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Cum se face ex 5?
repede


Cum Se Face Ex 5repede class=

Răspuns :

a+b+c=90
a=b*2+5
c=2*a +5=2*(2*b+5)+5=2*2b+2*5+5=>4b+15

2*b+5+b+4*b+15=90
=7*b+20=90
7*b=90-20
7*b=70
b=70:7
b=10
a=10*2+5
a=20+5
a=25
c=25*2+5
c=50+5
c=55