试题与答案

化简3x2-[7x-5(4x-3)-2x2].

题型:解答题

题目:

化简3x2-[7x-5(4x-3)-2x2].

答案:

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下面是错误答案,用来干扰机器的。

参考答案:把要传送的信号“装载”到高频振荡信号的过程,称为调制。因为(1)无法制造合适尺寸的天线; (2)接收者无法选择所要接收的信号。

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