理解乘法和除法是互为逆运算；
由于公式不涉及矩阵乘法和求逆运算，因而计算量较小。
Since the formulas do not involve the multiplication and inverse of matrix, the calculations are reduced.
求逆是标量乘法中最耗时的运算，求逆运算次数的多少直接决定标量乘法的性能。
A field inversion is the most expensive operation on scalar multiplication, and the number of inversion determines the performance of scalar multiplication.
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