问题
填空题
已知:(x3n-2)2x2n+4÷xn=x2n-5,则n=______.
答案
∵(x3n-2)2x2n+4÷xn=x2n-5,
x6n-4x2n+4÷xn=x8n÷xn=x7n=x2n-5,
∴7n=2n-5,
∴n=-1.
故答案为:-1.
已知:(x3n-2)2x2n+4÷xn=x2n-5,则n=______.
∵(x3n-2)2x2n+4÷xn=x2n-5,
x6n-4x2n+4÷xn=x8n÷xn=x7n=x2n-5,
∴7n=2n-5,
∴n=-1.
故答案为:-1.