Question

计算：根号8+4根号5-4根号2+根号45

Answer 1

根号8+4根号5-4根号2+根号45
=2根号2+4根号5-4根号2+3根号5
=7根号5-2根号2

Answer 2

=2√2+4√ 5-4√2+3√5
=-2√2+7√5

Answer 3

根号8+4根号5-4根号2+根号45=2倍根号2-4根号2+4根号5+3根号5
=-2根号2+7根号5
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