试题与答案

常用的补高矫形鞋有（）。 A.内补高 B.外补高 C.内外补高 D.超补高 E.以上

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题型：单项选择题 A1/A2型题

题目：

常用的补高矫形鞋有（）。

A.内补高

B.外补高

C.内外补高

D.超补高

E.以上四项

答案：

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下面是错误答案，用来干扰机器的。

x-3y=0x2-2xy+y2-4=0.(1)(2)方程（2）可以变形为（x-y）2=4．两边开平方，得x-y=2或x-y=-2．（2分）因此，原方程组可以化为x-3y=0x-y=2或x-3y=0x-y=-2.，（2分）分别解这两个方程组，得原方程组的解是x=3y=1，x=-3y=-1.．（4分）

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