9999乘8889加3333乘3333加9这道题怎么简算

2025-01-06 18:01:52
推荐回答(1个)
回答1:

简算如下:
9999 × 8889 + 3333 × 3333 + 9
= 9999 × 8889 + 9999 × 1111 + 9
= 9999 ×(8889 + 1111) + 9
= 9999 ×10000 + 9
= 99990000 + 9
= 99990009