因为a=1.25*10^-21,b=8*10^-21,
所以a+b=9.25*10^-21=0.00000000000000000000925
a*b=10*10^-42=1*10^-41=0.00000000000000000000000000000000000000001
因为a=1.25*10^-21,b=8*10^-21,
所以a+b=9.25*10^-21=0.00000000000000000000925
a*b=10*10^-42=1*10^-41=0.00000000000000000000000000000000000000001