设F(x)=x(x-1)(x-2)(x-3)····(x-100)。求F(50)的导数
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F'(50)=x(x-1)(x-2)(x-3)…(x-48)(x-49)(x-51)(x-52)…(x-99)(x-100)
=50*49*48*47*…*2*1*(-1)*(-2)*(-3)*…*(-49)*(-50)
=(50*49*48*…*3*2*1)²
=(50!)²
=50*49*48*47*…*2*1*(-1)*(-2)*(-3)*…*(-49)*(-50)
=(50*49*48*…*3*2*1)²
=(50!)²
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设F(x)=x(x-1)(x-2)(x-3)····(x-100)。
F'(x)=(x-1)(x-2)(x-3)····(x-100)+x(x-2)(x-3)····(x-100)+x(x-1)(x-3)····(x-100)
+x(x-1)(x-2)(x-3)····(x-49)(x-51)*……*(x-100)+x(x-1)(x-2)(x-3)····(x-99)
F'(50)=x(x-1)(x-2)(x-3)····(x-49)(x-51)*……*(x-100)
=50*49*……*3*2*1*(-1)*(-2)*……*(-50)
=(50!)^2
F'(x)=(x-1)(x-2)(x-3)····(x-100)+x(x-2)(x-3)····(x-100)+x(x-1)(x-3)····(x-100)
+x(x-1)(x-2)(x-3)····(x-49)(x-51)*……*(x-100)+x(x-1)(x-2)(x-3)····(x-99)
F'(50)=x(x-1)(x-2)(x-3)····(x-49)(x-51)*……*(x-100)
=50*49*……*3*2*1*(-1)*(-2)*……*(-50)
=(50!)^2
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