10分之1^(1-m)*10^(1-2m)*10^(2m+1)*(10分之1)^(m+1)
=10^(m-1)*10^(1-2m)*10^(2m+1)*10^(-m-1)
=10^(m-1+1-2m+2m+1-m-1)
=10^0
=1