Respuesta :

reant
Hello:
20-5×[4-3×(2-1)]-5-3;
=20-5×[4-6+3]-8;
=20-5×[1]-8;
=20-5-8;
=7

Bye :-)
20-5 [4-3 (2-1)]-5-3=
20-5 [4-3+1]-5-3=
20-5-5-3=
10-3=
7