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Stiind ca : 1 x 2 x 3 x a x 5 = 5 x 2 x 3 x 1,afla numarul necunoscut.

Răspuns :

2*3*a*5=10*3=6*a*5=30=30*a=30=30/30=1

1x2x3xax5=5x2x3x1
6xax5=30=>6ax5=30 =>6a=6 =>a=1