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(7la a 4-7la a 5):(7la a2-7)-2la a3*5

Răspuns :

(7⁴-7⁵):(7²-7)-2³*5 =
=
7⁴(1-7):7(7-1)-40 =
=7³(-6):6-40
=-
7³-40=
=-383