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2014-08-20T15:57:04+03:00
(3√2+12√2)-(7√2+10√2)
15√2-17√2=-2√2
2014-08-20T15:57:13+03:00
√18  =  \sqrt{9*2} =3* \sqrt{2}
√288 =  \sqrt{144 * 2} = 12 \sqrt{2}
√98  = \sqrt{49*2}  =7* \sqrt{2}
√200 =  \sqrt{100*2} =10 *  \sqrt{2}
(3*  \sqrt{2}  + 12 *  \sqrt{2} )- (7*   \sqrt{2 + 10 *  \sqrt{2} )
=15 \sqrt{2} -17 \sqrt{2} =-2 \sqrt{2}