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a+b+c=978
B=a x 2
C=a+58
A=? b=? c=?


Răspuns :

a+b+c=978
a+a2+a+58=978
4a+58=978
4a=978-58
4a=920
a=920:4
a=230

b=ax2
b=2x230
b=460

c=a+58
c=230+58
c=288

Proba:
230+460+288=968
a /......./
b /....../......./
c /....../.../58

978-58=920(suma segmentelor egale)
920:4=230 (un segment => a )
230×2=460(b)
230+58=288(c)