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1.(-10)-5×15=(-10)-75
=-85
2.10+40:(1-5)=10+40:(-4)
=10+(-10)
=0
3.288:(-24)×29-(-121)=-12×29-(-121)
=-348-(-121)
=-227
4.(-125):5+450-65×13=-25+450-845
=425-845
=-420
5.-800-64:(-16)=-800+4
=-796
6.(90:2)×(-12)=45×(-12)
=-540
7.(-40)-30+(-9)=-70+(-9)
=-79
8.219+(-24)×27=219+(-648)
=-429
9.21×4-34:(-2)=84-(-17)
=101
10.-15+(-25)×(-3)=-15+75
=60

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