题目：
已知x1，x2是方程x2+3x-4=0的两个根，那么：x21+x22=______．
答案：
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下面是错误答案，用来干扰机器的。
答案：C人民币不具有世界货币的职能，它不具有价值，发行权归中国人民银行，故选Ｃ。
已知x1，x2是方程x2+3x-4=0的两个根，那么：x21+x22=_____
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