Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and ...Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and its crystal structure determined by H. Strunz, but its natural occurrence was found from altered residues of hulsite by C. T.展开更多
在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1&...在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1</sub>-α<sub>n</sub>=f（n）,则α<sub>2</sub> -α<sub>1</sub>=f（1）,α<sub>3</sub>-α<sub>2</sub>=f（2）,…,α<sub>n-1</sub>-α<sub>n-2</sub>=f（n-2）,a<sub>n</sub>-a<sub>n-1</sub>= f（n-1）。上面各式相加,得α<sub>n</sub>=α<sub>1</sub>+sum from k=1 to n-1 f（k）（n≥2）。展开更多
文摘Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and its crystal structure determined by H. Strunz, but its natural occurrence was found from altered residues of hulsite by C. T.
文摘在递推数列中,通过递推公式来求数列通项公式是很常见且重要的问题。下面简单介绍四种递推数列求通项的方法。一、形如α<sub>n+1</sub>=α<sub>n</sub>+f（n）的递推式利用叠加法:把上式化为α<sub>n+1</sub>-α<sub>n</sub>=f（n）,则α<sub>2</sub> -α<sub>1</sub>=f（1）,α<sub>3</sub>-α<sub>2</sub>=f（2）,…,α<sub>n-1</sub>-α<sub>n-2</sub>=f（n-2）,a<sub>n</sub>-a<sub>n-1</sub>= f（n-1）。上面各式相加,得α<sub>n</sub>=α<sub>1</sub>+sum from k=1 to n-1 f（k）（n≥2）。
