1.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^21.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^2-7m+9),其中m=-2又1/2

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1.(x+3)(x-3)-(x+3)^2-(x+3)^22.(3m-2)(m-3)-3(m^21.(x+3)(x-3)-(x+3)^2-(x+3)^22.(3m-2)(m-3)-3(m^2-7m+9)

1.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^21.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^2-7m+9),其中m=-2又1/2
1.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^2
1.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^2-7m+9),其中m=-2又1/2

1.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^21.(x+3)(x-3)-(x+3)^2-(x+3)^2 2.(3m-2)(m-3)-3(m^2-7m+9),其中m=-2又1/2
(x+3)(x-3)-(x+3)^2-(x-3)^2
=x^2-9-x^2-6x-9-x^2+6x-9
=6x-x^2-27
(3m-2)(m-3)-3(m^2-7m+9)
=3m^2-11m+6-3m^2+7m-27
=-4m-21
=-4x(-2.5)-21
=10-21
=-11
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