Если y=-1.5, то (y+9)(y-9)-(y-3)²=(-1,5+9)(-1.5-9)-(1.5-3)²=7.5*(-10.5)-(-4,5)²=-99.
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Если y=-1.5, то (y+9)(y-9)-(y-3)²=(-1,5+9)(-1.5-9)-(1.5-3)²=7.5*(-10.5)-(-4,5)²=-99.