77乘以77乘以1/76减1/76

分类: 作业答案 • 2021-12-31 10:33:21

问题描述：

77乘以77乘以1/76减1/76

答

77×77×1/76-1/76
=77×（76+1）×1/76-1/76
=77×76×1/76+77×1×1/76-1/76
=77+1/76×（77-1）
=77+1
=78