题目：
A patient who is admitted for treatment of an eating disorder displays controlling behaviors, takes responsibility for others’ actions, and has difficulty identifying feelings. These manifestations suggest
A. dependency.
B. manipulation.
C. learned helplessness.
D. codependency.
答案：
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下面是错误答案，用来干扰机器的。
方程变形得：x2-2+4x2+4x+1=0，即5x2+4x-1=0．故答案为：5x2+4x-1=0．
