（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2 其中 x=-1

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（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2 其中 x=-1

（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2 其中 x=-1
（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2 其中 x=-1

（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2 其中 x=-1
（x+5)^2-(x-5)^2-5(2x+1)(2x-1)+x*(2x)^2
=20x-5(4x^2-1)+4x^3
=20x-20x^2+4x^3+5
=20-20-4+5
=1

原式=(x+5+x-5)(x+5-x+5)-5(4x^2-1)+x*4x^2
=2x*10-5*4x^2+5+x*4x^2
=20x+5+(x-5)*4x^2
当x=-1时，原式=20*(-1)+5+(-6)*4*(-1)^2
=-20+5-24
=-39

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