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Answer:
1.-127
2.9
3.54
4.269
Step-by-step explanation:
first open the bracket in all the sums
1.-102+-56+31
=-102-56+31
=-158+31
=-127
2.67+-42+-16
=67-42-16
=67-58
=9
3.112+-42+-16
=112-42-16
=112-58
=54
4.312+-99+56
=312-99+56
=312-43
=269