1. -15+64+36-45= 2. 27-82+43-18= 3. -44+88-56-38 =. 4. 24-50-25+76 =.
1) ( 64+ 36)-(45+ 15)=40 2) ( 27+ 43)- ( 82+ 18)=-30 3)88- ( 44+56+38)=-50 4)(24+76)-(50+25)= 25