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-3×[1-3×(-3+2×5)] va rog !!

Răspuns :

- 3 × [ 1 - 3 × ( - 3 + 2 × 5 ) ] =
= - 3 × [ 1 - 3 × ( - 3 + 10 ) ] =
= - 3 × [ 1- 3 × ( +7 ) ] =
= - 3 × ( 1 - 3 × 7 ) =
= - 3 × ( 1 - 21 ) =
= - 3 × ( - 20 ) =
= + 60 =
= 60