Question

Efectuați c) 1+{2+[3×(4+5)-6+7×8]-9} d) 9×{[8+7×(6+5)]×4-3}+2​

Answer 1

c)1+{2+[3×(4+5)-6+7×8]-9}

=1+[2+(3×9-6+7×8)-9]

=1+[2+(27-6+56)-9]

=1+[2+(21+56)-9]

=1+(2+77-9)

=1+(79-9)

=1+70

=71