根号5—根号5分之1+2分之1根号20?
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√5-√(1/5)+√20/2
=√5-√[(1×5)/(5×5)]+√(2²×5)/2
=√5-√5/5+2√5/2
=√5-√5/5+√5
=2√5-√5/5
=10√5/5-√5/5
=9√5/5,10,√5-√(1/5)+√20/2
=√5-√[(1×5)/(5×5)]+√(2²×5)/2
=√5-√5/5+2√5/2
=√5-√5/5+√5
=2√5-√5/5
=10√5/5-√5/5
=9√5/5,0,
=√5-√[(1×5)/(5×5)]+√(2²×5)/2
=√5-√5/5+2√5/2
=√5-√5/5+√5
=2√5-√5/5
=10√5/5-√5/5
=9√5/5,10,√5-√(1/5)+√20/2
=√5-√[(1×5)/(5×5)]+√(2²×5)/2
=√5-√5/5+2√5/2
=√5-√5/5+√5
=2√5-√5/5
=10√5/5-√5/5
=9√5/5,0,
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