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Copune o problema dupa expresia :
 [ a + ( a + b ) + ( a - c )] x d =


Răspuns :

[9+(9+3)+(9-6)]x3=
9+12+3x3=
9+12+9=30

[30+(30+25)+(30-10)]x 5=525
(30+55+20)x5=525
(85+20)x5=525
105x5=525