已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:a+b,b-a.

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已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:a+b,b-a.已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:

已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:a+b,b-a.
已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:a+b,b-a.

已知a=0.00...(2000个0)0125,b=0.00...(2004个0)08,求:a+b,b-a.
a+b=0.000..(2000个0)012508;
b-a=-0.000.(2000个0)012492;

a=1.25×10^(-2001)=12500×10^(-2005)
b=8×10^(-2005)
所以a+b=12508×10^(-2005)=0.0(2000个0)12508
b-a=-12492×10^(-2005)=-0.0(2000个0)12492

a=0.00...(2000个0)0125,b=0.00...(2004个0)08
a = 125 * 10^(-24) = 12500 * 10^(-26)
b = 8 * 10^(-26)
a + b = 12500 * 10^(-26) + 8 * 10^(-26) = 12508 * 10^(-26)
b-a = -12492 * 10^(-26)