99+99×99+99×99×99=_.
问题描述:
99+99×99+99×99×99=______.
答
99+99×99+99×99×99,
=99×[1+99+99×99],
=99×[1+99×(99+1)],
=99×[1+9900],
=(100-1)×9901,
=990100-9901,
=980199;
故答案为:980199.