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解:(1)=9x^2-2x3x4+16
=9x^2-24x+16
(2)(3a-2b)^2
=9a^2-2x3ax2b+4b^2
=9a^2-12ab+4b^2
(3)(2a+3)^3
=(2a+3)(4a^2-6a+9)
=8a^3-12a^2+18a+12a^2-18a+27
=8a^3+27
(4)(-5p-3)(5p-3)
=-(5p+3)(5p-3)
=-(25p^2-9)
=-25p^2+9
=9x^2-24x+16
(2)(3a-2b)^2
=9a^2-2x3ax2b+4b^2
=9a^2-12ab+4b^2
(3)(2a+3)^3
=(2a+3)(4a^2-6a+9)
=8a^3-12a^2+18a+12a^2-18a+27
=8a^3+27
(4)(-5p-3)(5p-3)
=-(5p+3)(5p-3)
=-(25p^2-9)
=-25p^2+9
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