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=-13-5
=-18
b.12-10-4
=2-4
=-2
c.-9+8-7+6
=-1-7+6
=-8+6
=-2
2.a.(-7)×9
=-63
b.6×(-7)
=-42
c.(-3)×(-9)
=27
3.a.15+(5×(-6))
=15+(-30)
=15-30
=-15
b.12×(-7)+(-16)÷(-2)
=-84+8
=-76
c.-15÷(-3)-7×(-4)
=5+28
=33