9n

For example , when they are used to solve system of quasi-tridiagonal equations , the number of multiplication and division operation changes form 11n - 16 to 9n + 20 comparing with LU decomposition method .

比如，在求解拟二对角方程组时，和利用LU分解法相比，乘除运算的次数由11n-16变为9n+20，所需要设定的向量组由5个降为4个。

In order to get higher sawing efficiency and sawing ratio when cutting granite , the optimized parameters based on the experiment were 200 ~ 230 ~ ( # ) for diamond grain size , 9N for feed load and 20m / s for cutting speed .

锯切花岗岩时，要保证较高的锯切效率和锯切比，在本试验范围内，最佳工艺参数为：采用金刚石粒度为200~230的锯丝，进给压力为9N，锯丝速度为20m/s。

The electrolyte for the detector cell is 9N H_2SO_4 . After Teflon membrane of 0 . 5 mil thickness was roughened by surface and treated with polymeric substance , the peak current response of the membrane covered electrode generally enlarged 100-fold .

检定池的电解质为9NH2SO4。厚0.5-Mil的聚四氯乙烯膜由表面粗糙化和用聚合物质处理以后，覆膜电极检定器的电流响应一般增加100倍以上。