199加99乘99
=199+99×99
=100+99+99×99
=100+99×100
=100×(1+99)
=100×100
=100保称次深00
199加99乘99怎么巧算?
jacky
2024-06-22 13:38
阅读 520
jacky
2024-06-22 13:38
阅读 520
