牛顿迭代法 若高阶非线性方程组: u ( x , y) = 0 v ( x , y) = 0 可以用迭代公式 -Newton iteration if the higher-order nonlinear equations: u (x, y) = 0v (x, y) = 0 can be used iterative formula

用牛顿差值法来求解函数在自变量x的取值y。-using newton method to solve function.

wihle语句，如果循环达到要求就跳出，或者达到一定的迭代步数即停止-wihle statement, if the loop meet the requirements to come out, or up to a certain number of iteration is stopped