3x^2-xy+2y^2 х=√6,y=√15
√6^2*3- √6* √15+2* √15^2 =18- √90+30=48- √90=48-3 √10
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3x^2-xy+2y^2 х=√6,y=√15
√6^2*3- √6* √15+2* √15^2 =18- √90+30=48- √90=48-3 √10