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a x b = 90
b=cx 3
c=d: 10
d-e = 250
e:10=5


Răspuns :

Răspuns:

e:10=5=> e=5×10=>e=50

d-50=250=>d=250+50=>d=300

c=300÷10=>c=30

b=30×3=90

a×90=90=>a=90/90=>a=1