Question

1+2x[3+4x(5+6x7)]-8x9

Answer 1

1+2x[3+4x(5+42)]-8x9=
=1+2x(3+4x47)-8x9=
=1+2x(3+188)-8x9=
=1+2x191-8x9=
=1+382-72=
=383-72=
=311=

Answer 2

=1+2×[3+4×(5+42)]-72=
=1+2×(3+4×47)-72=
=1+2×(3+ 188)-72=
=1+2×191-72=
=1+ 382-72=
=383-72=
=311 CORONIȚĂ PLZ!!!