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7×[5×3-( 4×3-5)] +3×4

Răspuns :

=7x(5x3-7)+12

=7x8+12

=56+12

=68

7×[5×3-(4×3-5)]+3×4
7×[15-(12-5)]+12
7×(15-7)+12
7×8+12
56+12
=68