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(7^4+2×7^5+3×7^6):162

Răspuns :

(7^4+2×7^5+3×7^6):162 =

= 7^4 ×(1 + 2×7^1 + 3 ×7^2) : 162 =

= 7^4 × (1 + 14 + 3 × 49) : 162 =

= 7 ^4 × (15 + 147) : 162 =

= 7^4 × 162 : 162 =

= 7^4 × 1 =

= 2 401