164 THE FASCINATION OF NUMBERS
Thus (1-002) (1-003) =1 +-'002 4003 approx.
=1-005
The degree of error is again very small, the actual value being
1-005006
By similar methods, the expression:
(1+2)
(1+)
may be reduced to I4x—y

where x and y are very small.
Thus,

1'005

1002

 

=1 +-005 —*002

=1-003

0

21

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