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- 3已知代数式12xa-1y3与-3x-by2a+b是同类项,那么a,b的值分别是( ) A.a=2b=−1 B.a=2b=1 C.a=−2b=−1 D.a=−2b=1
- 4what a lovely little girl she
- 5已知a>0,函数f(x)=(1-x)/ax +lnx在(1,+∞)上是增函数,设b>0,求证:1/(a+b)
- 6i am sorry ,i have broken your cup 答语是什么
- 7There are some orange trees on the farm.改单数
- 8对于分式x+a+b除以a-2b+3x,已知当x=3时,分式为0;当x=-2时,分式无意义,试求a,b的值
- 9英语翻译
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