х²-6ху+9у²-9у²+6ху-у² = х²-у² = (х-у)(х+у) = (-3-3,5)(-3+3,5) = -6,5×0,5 = -3.25
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х²-6ху+9у²-9у²+6ху-у² = х²-у² = (х-у)(х+у) = (-3-3,5)(-3+3,5) = -6,5×0,5 = -3.25