rongyan
熔岩   Guangzhou, Guangdong, China
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16
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逆风笑的游戏污
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Human Fall Flat Workshop
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robertswintonkhx
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SleepyM1n
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Meng.
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Counter-Strike 2
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萌萌哒法克鱿|Lovely_Squid
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初瀬いづな^
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Abiotic Factor
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8.8 hours past 2 weeks
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last played on 2 Apr
Let's Patiti!
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last played on 1 Apr
Euro Truck Simulator 2
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5.8 hrs on record
last played on 31 Mar
Party Club
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美女威信桐城扫码月抛 27 Mar @ 1:39am 
和闺蜜在酒店无聊。一起出来玩
这苍茫大海葬着多少立志 1 Jan, 2023 @ 11:17pm 
例4中，分母有复根。
为了求A，变成
3/(x^2-x+1)=A+(Bx+C)(x+1)/(x^2-x+1)
令x=-1得到A=1
（重点）为了求B和C，变成
3/(x+1)=A(x^2-x+1)+(Bx+C)
令x^2-x+1=0，于是x^2=x-1
3/(x+1)=Bx+C
3=(Bx+C)(x+1)=Bx^2+(B+C)x+C=(2B+C)x+(-B+C)
因此2B+C=0，-B+C=3
B=-1,C=2