please help me 在百度空间相册里

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please help me 在百度空间相册里
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please help me 在百度空间相册里
please help me
在百度空间相册里

please help me 在百度空间相册里
(x-3)/(x²+6x+9) + x/(9-x²)
= (x-3) / (x+3)² - x / [(x+3)(x-3)]
= [ (x-3)² - x(x+3) ] / [ (x+3)²(x-3) ]
= (x² - 6x+9 - x² - 3x) / [ (x+3)²(x-3) ]
= (9-9x) / [ (x+3)²(x-3) ]
x=2代入得
(9 - 9*2) / [ (2+3)²(2-3) ]
= 9/25

上哪看？上百度空间相册的路怎么走？

先森，你是匿名啊········

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