−9(0,1p−t)2=-9(0,01p^2-0,1pt+t^2)=
=-0,09p^2+0,9pt-9t^2
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−9(0,1p−t)2=-9(0,01p^2-0,1pt+t^2)=
=-0,09p^2+0,9pt-9t^2