计算 987654321×123456789-987654320×123456788=_.

问题描述:

计算 987654321×123456789-987654320×123456788=______.

987654321×123456789-987654320×123456788
=987654321×(123456788+1)-987654320×123456788
=987654321×123456788+987654321-987654320×123456788
=(987654320+1-987654320)×123456788+987654321
=123456788+987654321
=1111111109
故答案为:1111111109.