6-2根号5=1-2根号5+(根号5)^2=(1-根号5)^2接下来代入就行了
题目是这样的吗?1/(x-2)+1/(x+2) 乘以(x*x-4)/2(x-1) =2x/(x*x-4) 乘以(x*x-4)/2(x-1) =x/(x-1)代入数据,你会分母有理化吗?
你这题目都没说清楚,歧义太多了