混合基快速傅里叶算法实现，针对任意长信号序列，按照预设分解成不同的基进行预算，减少除法与三角函数使用，精度高速度快。-Mixture Fast Fourier-based algorithm for arbitrarily long signal sequence, in accordance with the different pre-set into the base budget and reduce the use of division and the trigonometric f

比较两个长整数绝对值的大小,以及两个长整数的加减乘除运算-Comparison of two long integer absolute value, as well as two long integer addition and subtraction, multiplication and division

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笔算开方，利用长除法求浮点数的平方根，有优点是迭代次数少，缺点：只能算到小数点后4-5位-4-5 can only count to one decimal: written calculation prescribing, use long division square root of floating-point number has the advantage of fewer iterations, shortcomings