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(7 la puterea a 4-a+2x7 la puterea a5-a+3x7la puterea a6-a):162=
AM NEVOIE REPEDEEEE!



Răspuns :

= dam factor comun 7^4
= 7^4 (1+2x7 + 3x7^2) : 162=
= 7^4 (1+14+147) :162=
= 7^4 x 162: 162=
=7^4 = 49^2 = 2401