根号2减1等于1除以1加跟2么?为什么...
问题描述：
根号2减1等于1除以1加跟2么?为什么...
答
1 / (1 + √2 ) = (√2 - 1 ) / [(√2 - 1 )(√2+ 1)] = (√2 - 1 ) / [(√2)^2 - 1^2] = (√2 - 1 ) / (2 - 1) = √2 - 1
根号2减1等于1除以1加跟2么?为什么...
1 / (1 + √2 ) = (√2 - 1 ) / [(√2 - 1 )(√2+ 1)] = (√2 - 1 ) / [(√2)^2 - 1^2] = (√2 - 1 ) / (2 - 1) = √2 - 1