问题
解答题
计算:98766×98768-98765×98769.
答案
98766×98768-98765×98769,
=(98765+1)×98768-98765×(98768+1),
=98765×98768+98768-(98765×98768+98765),
=98765×98768+98768-98765×98768-98765,
=98768-98765,
=3.
计算:98766×98768-98765×98769.
98766×98768-98765×98769,
=(98765+1)×98768-98765×(98768+1),
=98765×98768+98768-(98765×98768+98765),
=98765×98768+98768-98765×98768-98765,
=98768-98765,
=3.