1992x19911991-1991x19901990
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1992x19911991-1991x19901990
解:
1992x19911991-1991x19901990
=1992×1991×10001-1991×1990×10001
=(1992-19910)×1991×10001
=2×1991×10001
=39823982
解:
1992x19911991-1991x19901990
=1992×1991×10001-1991×1990×10001
=(1992-19910)×1991×10001
=2×1991×10001
=39823982
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1992x19911991-1991x19901990
=1991x19911991-1991x19901990+19911991
=1991×(19911991-19901990)+19911991
=1991 ×10001+19911991
=19910000+1991+19911991
=19911991×2
=39823982
=1991x19911991-1991x19901990+19911991
=1991×(19911991-19901990)+19911991
=1991 ×10001+19911991
=19910000+1991+19911991
=19911991×2
=39823982
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1992x19911991-1991x19901990
=1991x(1992x10001-19901990)
=1991x(1992x10001-1990x10001)
=1991x10001x(1992-1190)
=3982x10001
=39823982
=1991x(1992x10001-19901990)
=1991x(1992x10001-1990x10001)
=1991x10001x(1992-1190)
=3982x10001
=39823982
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