2根号XY×根号Y\X(Y
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2根号XY×根号Y\X(Y
2根号XY×根号Y\X(Y
2根号XY×根号Y\X(Y
2根号XY×根号Y\X(Y
2根号XY×根号Y\X (Y<0)
=2√(XY×Y\X)
=2√Y²
=-2Y
5根号45×2\3根号2\3
=5×3√5×2\3×√6/3
=5×3×2/3/3×√5×√6
=10√30/3