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=2x²-7xy+6y²-(9y²-12xy+4x²)+9y²=
=2x²-7xy+6y²-9y²+12xy-4x²+9y²=
=-2x²+5xy+6y²
-2x²+5xy+6y²= -2(0,03)²+5(0,03)(⅖) +6(⅖)²=
=-2 * 0,0009 + 0,06 + 24/25 = 0.0018 + 0.06+ 0.96 = 1,0218