Question

como hacer este ejercicio 3+{3-6-[9+12-(4+9)]}

Answer 1

3+{3-6-[9+12-(4+9)]}=3+{3-6-[21-(13)]}=3+{-3-[8]}=3+{-11]}=3-11=-8

Answer 2

3+{ 3-6-[ 9+12-( 4+9 ) ] }

3+{ 3-6-[ 9+12-( 13 ) ] }

3+{ 3-6-[ 9+12- 13 ] }

3+{ 3-6-[ 21- 13 ] }

3+{ 3-6- 8 }

3+{ 3-14 }

3 -11

-8