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Afla numerele a,b,c astfel incat .axb=b, bxb=c, c+9=13

Răspuns :

c+9=13
c=13-9
c=4
b×b=c
b×b=4
b=4:2
b=2

a×b=b
a×2=2
a=2:2
a=1

Verificare: 1×2=2
2×2=4
4+9=13