вычислите:
(-17+15-4):2=
(23-31+22):(-7)=
(-10-20-90):12=
(48+25-48-13):(-6)=
(-17+15-4):2=
(23-31+22):(-7)=
(-10-20-90):12=
(48+25-48-13):(-6)=
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2)-2
3)-10
4)-2
вычисления в уме