Răspunsuri

2014-10-25T12:50:29+03:00
120-25=70 primu nr
120-26=100 al doilea nr .
100+70=170 al treilea nr 
sper ca te-am ajutat
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2014-10-25T12:50:39+03:00
A+b+c=240
a-x=25⇒a=25+x
b-x=26⇒b=26+x
c-x=120⇒c=120+x
-----------------------
a+b+c=240
25+x+26+x+120+x=240
171+x=240
x=240-171
x=69

a=25+x⇒a=25+69=94
b=26+x⇒b=26+69=95
c=120+x⇒c=120+69=189