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2014-06-09T19:52:05+03:00
2√2-√50 = 2√2-5√2= -3√2
⇒ -√3² · 2 = -√18 
2014-06-09T19:53:13+03:00
√50=5√2
√18=3√2
2√2-5√2=-3√2