根号下8-根号下72+根号下2分之9

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根号下8-根号下72+根号下2分之9
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根号下8-根号下72+根号下2分之9
根号下8-根号下72+根号下2分之9

根号下8-根号下72+根号下2分之9
√8-√72+9/√2
=2√2-6√2+9√2/2
=﹣4√2+9√2/2
=√2/2.

=2√2-6√2+3√2/2
=-5√2/2

=2根号下2-6根号下2+根号下4分之18
=-4根号下2+2分之3根号下2
=-2分之5根号下2