99乘99+99+99乘99乘法分配律
问题描述:
99乘99+99+99乘99乘法分配律
答
99*99+99+99*99
=(100-1)*99+99+99*(100-1)
=9900-99+99+9900-99
=19800-99
=19800-100+1
=19701