99×99+199怎样用简便方法计算

2025-03-30 07:20:58
推荐回答(1个)
回答1:

99×99+199
=99x99+(99+100)
=99x99+99x1+100
=99x(99+1)+100
=99x100+100x1
=100x(99+1)
=100x100
=10000