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在七年级学过多项式的乘法公式后,常会出现如下的题目:问题1已知实数x满足x2+x-1=0,求x2+1/x2的值?可以这样解:
After learning the polynomial multiplication formula in the seventh grade, the following questions often appear: Question 1 Given that the real number x satisfies x2+x-1=0, find the value of x2+1/x2? This can be solved as follows: