Question

efetue:
1-4+1-6=
3-25+2-5=
3-10+1-4=
4-5-2-3=
​

Answer 1

1-4+1-6=
= 2-4-6
= 2-10
= -8

3-25+2-5=
= 5-25-5
= 5-30
= -25

3-10+1-4=
= 4-10-4
= 4-14
= -10

4-5-2-3=
= 4-10
= -6