Question

20 -{-10-[-8+(5-12)]-20}

Answer 1

Olá,

Vamos lá,

=20 - {-10-[-8+(5-12)]-20}
=20 - {-10-[-8+(-7)]-20}
=20 - {-10-[-8-7]-20}
=20 - {-10-[-15]-20}
=20 - {-10+ 15-20}
=20 - {-15}
=20 + 15
=35