99乘38加99怎么简便计算

问题描述:

99乘38加99怎么简便计算

转化为(100-1)×(40-2)﹢99=100×40-100×2-40+2﹢99=3861

99x38+99
=99x39
=100x39-99
=3900-99
=3801

99×38+99
=99×(38+1)
=99×39
=(100-1)×39
=3900-39
=3861