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A simple method of multiplying 98 by 97 in 99 points of Yangtze River math homework in sixth grade.
98 times 97 in' 99.

=98/99X97

=98/99X(99-2)

=98/99X99-98/99X2

=98-98/99X2

=96+2-98/99X2

=96+2( 1-98/99)

=96+2/99

=96 2/99

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