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Cum se resolva (7la4+2×7la5+3×7la6)÷162

Răspuns :

(2401+33614+352947):162=2401
 (7+2×7+3×7):162=
=7
⁴(1+2x7+3x7²):162
=7⁴(1+14+147):162
=7⁴x162:162
=7⁴
=2401