1. , _______.
.
.
.
.
2. __________.
.
.
.0
.1
3. ________.
.
.
.0
.1
4. +28 +43 ______.
.+71
.-71
.+15
.-15
5. ?
.+7 + -4 = +3
.-9 - +3 = -12
.-8 - -10 = +2
.-15 + -3 = -12
6. ______.
.
.
.
.1
7. ______.
.
.
.
.0
8. -420 +15?
.-18
.+18
.-28
.-180
9. -12 -15?
.+150
.-150
.+180
.-180
10. +49 - -25=?
.-74
.+74
.+24
.-24

​