Question

espressoes ( 2_3)-1+4-1-5-1=

Answer 1

 ( 2_3)-1+4-1-5-1=
 
( 2-3)-1+4-1-5-1=
( -1)-1+4-1-5-1=
-2+4-1-5-1=
2-1-5-1=
1-5-1=
-4-1=-5

resposta: - 5