困難的數學題目 若x-1/y=5,xy+1/xy=22,求y-1/x=?

2019-09-15 11:57 pm

回答 (1)

2019-09-16 12:27 am
(x - 1/y)(y - 1/x) = xy + 1/(xy) - 2
5(y - 1/x) = 22 - 2
y - 1/x = 4


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