分子分母都把第一个因式和第四个,第二个和第三个相乘,见以下草稿涂鸦:

分子分母都把第一个因式和第四个,第二个和第三个相乘,见以下草稿涂鸦:

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好!也可以用笨方法硬解。
-wxcfan123-
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04/26/2024 postreply
14:07:10
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