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1·Under the certain conditions, the average RCS of targets with complex shape are generally subject to the arithmetic sum of the mean RCS by local reflection area.

在一定的条件下，复杂形体的目标平均雷达截面积近似地由局部反射区域平均雷达截面积的算术和来确定。

2·Instead they may involve, at most, a little arithmetic, such as the sum of two odd numbers is even, and common sense.

相反，它们最多可能涉及一点算术，比如“两个奇数之和为偶数”，以及常识。

3·We first introduce methods of finding the sum of the first n terms for an arithmetic sequence of higher order.

我们首先介绍了高阶等差数列前 n 项和的求解方法。

4·Note that, in this example, sum must be initialized to an explicit floating-point value; otherwise, all the subsequent computations will be done using integer arithmetic.

注意，在本例中，sum 必须被初始化为一个显式的浮点值；否则，所有后续计算都将使用整数运算计算。

5·In fact, there are some very old books that show this as the average, the sum divided by two arithmetic mean, but the modern practice is to use the geometric mean.

事实上，一些很老的书籍上，平均的定义就是算数意义的，总的来说被分为两种算数意义，但现代我们多用几何意义。

6·Every large odd integer can be represeted as the sum of three primes which take from arithmetic progressions.

解决了三素数定理推广到素数取自算术级数的问题。

7·We first introduce three methods of finding the sum of the first n terms for an arithmetic sequence of higher order, and then display another method by some formal derivatives of which are defined.

首先，简要介绍了三种主要的求和方法。然后，根据高阶等差数列通项的特性，利用新定义的形式导数列对其进行了有效的探讨。

8·By computer simulation with convolution sum of FIR digital filter, the results show that the model is the same as traditional binary coding arithmetic which can be used in chaotic...

通过FIR数字滤波器卷积和操作的计算机数值仿真表明，采用这些方法运算得到的结果与传统二进制算术编码算法完全等效，可应用于混沌信号处理系统。