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2009-10-11T12:28:33+02:00
(√2-√6)(√2+√6) = √4-√36= 2-6= -4
(3√6- 2√10)(3√6+2√10)=9√36-4√100=9*6-4*10=54-100= - 46
√2+3*√2-√3 = 4√2-√3
√4-2√3*√4+2√3 = √4-2√3*4+2√3 = 2-4√3+2√3=2-2√3