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2014-11-09T22:50:18+02:00
3/2√5=(3·2√5)/2√5·2√5=6√5/20=3√5/10
√20/3=2√5/3
(4√5/5-3√5/10):(-2√5/3)=
(8√5-3√5)/10·(-3/2√5)=
(5√5/10)·(-3/2√5)= simplif=-3/4
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