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2. 80
3. -4
4. -16
5. -5
=12+-4
=8
2. 40:(-4)×(-8)
=-10×-8
=80
3. 5+[(-27):3]
=5+-9
= -4
4. [18:(-2)]+(-7)
= -9+-7
= -16
5. (-8)-[(-6):2]
= -8-3
= -11