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我快被气死了。
June
来一发更新压压惊。
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窝谔谔(
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一些奇怪的数学题
导数例一已知函数 $f(x)=x \sin x+2 \cos x+a x^{2}$,记 $f(x)$ 的导函数为 $f'(x)$,并定义当 $a=0$ 时...
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