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2)...=7^(1+(-3))=7^-2=-1/49
3)...=5^2=25
4)...=5^-4=(1/5)^4=1/625
5)...=(-7)^(9-10)=(-7)^-1=-1/7
6)...=(-5)^(-1*2)=(-5)^(-2)=(-1/5)^2=1/25
7)...=10^(2+(-6)) : 10^-3=
=10^-4:10^-3=10^(-4-(-3))=10^-1=1/10