（x+2)^5-(x-2)(x-3)=(x^2+4x+4)(x^2+4x+4)(x+2)-(x^2-5x+6)
=(x^4+4x^3+4x^2+4x^3+16x^2+16x+4x^2+16x+16)(x+2)-x^2+5x-6
=(x^4+8x^3+24X^2+32x+16)(x+2) -x^2+5x-6
=x^5+8x^ 4+24x^3+32x^2+16x+2x^4+16x^3+48x^2+64x+32-x^2+5x-6
=x^5+10x^4+40x^3+79x^2+85x+26
（x+2)^5-(x-2)(x-3)
=x^2+4x+4-(x^2-5x+6)
=x^2+4x+4-x^2+5x-6
=x^2-x^2+4x+5x+4-6
=9x-2
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