1990×19911991-1991×19901990要有具体的式子.

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1990×19911991-1991×19901990要有具体的式子.
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1990×19911991-1991×19901990要有具体的式子.
1990×19911991-1991×19901990
要有具体的式子.

1990×19911991-1991×19901990要有具体的式子.
1990*19911991-1990*19901990-1*19901990
=1990*(19911991-19901990)-19901990
=1990*10001-19901990
=0
这个可以吗?答案是0!

1990 * 19911991-1991 * 19901990
= (1991 - 1) * 19911991-1991 * 19901990
= 1991 * (19911991 - 19901990) - 19911991
= 1991 * 10001 - 19911991
= 1991 * 10000 + 1991 - 19910000 - 1991
= 0