123²-122x124
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/15 18:22:26
123²-122x124
123²-122x124
123²-122x124
123²-122x124
=123²-(123-1)(123+1)
=123²-(123²-1)
=123²-123²+1
=1
123²-122x124
123²-122x124
123²-122x124
123²-122x124
=123²-(123-1)(123+1)
=123²-(123²-1)
=123²-123²+1
=1