1.(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)= 2 若-4x(10的平方)=ax(10的n次方),求(a+n)的值
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![1.(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)= 2 若-4x(10的平方)=ax(10的n次方),求(a+n)的值](/uploads/image/z/2700947-11-7.jpg?t=1.%281%2F2-1%29%2A%281%2F3-1%29%2A%281%2F4-1%29%2A%E2%80%A6%E2%80%A6%2A%281%2F20-1%29%3D+2+%E8%8B%A5-4x%EF%BC%8810%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%89%3Dax%EF%BC%8810%E7%9A%84n%E6%AC%A1%E6%96%B9%EF%BC%89%2C%E6%B1%82%EF%BC%88a%2Bn%EF%BC%89%E7%9A%84%E5%80%BC)
1.(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)= 2 若-4x(10的平方)=ax(10的n次方),求(a+n)的值
1.(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)= 2 若-4x(10的平方)=ax(10的n次方),求(a+n)的值
1.(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)= 2 若-4x(10的平方)=ax(10的n次方),求(a+n)的值
(1/2-1)*(1/3-1)*(1/4-1)*……*(1/20-1)
=(-1/2)*(-2/3)*...*(-19/20)
=-(1/2)*(2/3)*...*(19/20)
=-1/20
-4*10^2=a*10^n
a=-4
n=2
a+n=-4+2=-2