65²×7-35²×7 简便方法

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65²×7-35²×7简便方法65²×7-35²×7简便方法65²×7-35²×7简便方法65²×7-35²×7=(65

65²×7-35²×7 简便方法
65²×7-35²×7 简便方法

65²×7-35²×7 简便方法
65²×7-35²×7
=(65²-35²)×7
=(65+35)×(65-35)×7
=100×30×7
=21000