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【OG20-P284-357题】
If x, y, and z are positive numbers, what is the value of the average (arithmetic mean) of x and z ?
(1) x - y = y - z
(2) x2 - y2 = z
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xy就是未知数,不是具体值!
题目讨论 (5条评论)

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221161mrci
什么几把烂题
0
0 回复 2023-05-13 22:13:47
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389953neag
啥意思啊
0
0 回复 2022-09-23 10:56:10
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冲他丫的
没值你算个屁啊
3
0 回复 2021-10-17 16:19:44
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Zhazha
Y居然是个未知数,坑爹了
3
0 回复 2019-08-16 16:07:26
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prayer
到底要怎么确定字母究竟是已知数还是未知数呀。。。
2
0 回复 2019-07-18 19:18:01