Question

7-2 =
5-8=
45-78+59=
12+6-19+4-5=
6-9-6+12=
12+5=
4-5-6+8=
12+(5-17+1)=
45-46+(-6+2)=
6-(5+9-4)+9=

Answer 1

7-2 =5

5-8= - 3

45-78+59=26

12+6-19+4-5=2

6-9-6+12=3

12+5= 17
 
4-5-6+8=1

12+(5-17+1)= 1
 
45-46+(-6+2)= - 5

6-(5+9-4)+9= 15-10 = 5