a) 5+7-9/3-6+12-10/3
=> 3/3 -8/3
=> 3-8/3
=> -5/3
b) 15-16+12/5-26+18+13/5
=>11/5-21/5
=>-10/5
c) -23+14/11 • (-17+8-9/11+15-23/11)
=>-9/11 •(-18/11 -8/11)
=> -9/11 • (-26/11)
=>234/121
d) 27-12-24/6-25+13+7/6+16-13/6
=>-11/6-45/6+3/6
=> 59/6
Sper ca te am ajutat :)