根号5乘(根号5-根号5分之一)怎么化简

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方法1：
√5*[√5-√(1/5)]
=√5*√5-√5*√(1/5)
=5-1
=4

方法2：
√者游5*[√5-√(1/5)]
=√5*[√游哗5-1/(√5)]
=√5*[√5-(√首磨销5)/5]
=√5*[(4√5)/5]
=4

注意：√(1/5)=（√1）/（√5)=1/(√5)=(√5)/5

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4

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