primer tarea 20/08/09

10-18-(2)(4)5
10-20(4)5
-10+20=10


(15/3)+2(18)-6-3-4
5-30-13
5+23=28


(8)(15)(7)
120(7)=840


(-10)(-22)(-40)
(220)(-40)=-8.800


-5-11+25+104
-6-79=-85


(15/3+2)-40+16
7-24=-17


7(-6)+1+20(-2)
-42-41=-83