Question

{1+2•[3+4•(5•6+7)]}:3-100

Answer 1

{1+2•[3+4•(5•6+7)]}:3-100={1+2*[3+4*(30+7)]}:3-100=
={1+2*[3+4*37]}:3-100={1+2*[3+148]}:3-100=
={1+2*151}:3-100={1+302}:3-100=303:3-100=
=101-100=1

Answer 2

acolada 1+2*paranteza dreapta 3+4*(30+7)inchidem toate parantezele :3-100
=paranteza dreapata 1+2*(3+4*37)inchidem paranteza dreapta :3-100=paranteza dreapta 1+2*(3+148)inchidem p dreapta :3-100=(1+2*151):3-100=(1+302):3-100=302:3-100=100,(6)7-100=0,(6)7