根号(29²-21²)怎么化简啊
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/04 02:49:51
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根号(29²-21²)怎么化简啊
根号(29²-21²)怎么化简啊
根号(29²-21²)怎么化简啊
根号(29²-21²)
=根号(29+21)(29-21)
=根号50*8
=根号400
=20
平方差公式
根号(29²-21²)
=√(29-21)(29+21)
=√8*50
=√400
=20