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1) -4+9 2) -15+8 3) -1/2+3/4 4) -9+4 5) ...

1) `-4+9` 2) `-15+8` 3) `-1/2+3/4` 4) `-9+4` 5) `-8+15` 6) `-3/4+1/2`

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1) `-4+9=9-4=5` 2) `-15+8=8-15=-7` 3) `-1/2+3/4=3/4-1/2=3/4-2/4=1/4` .4) `-9+4=4-9^prime=-5` 5) `-8+15=15-8=7` 6) `-3/4+1/2=1/2-3/4=2/4-3/4=-1/4`
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