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- 2mary likes china very much.改为一般疑问._____mary_____china very much?
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- 7Na2CO4+Ba(NO3)2== Cu+Hg(NO3)2==
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- 10因式分解:(1)x的平方y-4xy+4y= (2)a的三次方-10a的二次方+25a= (3)x的平方+2x+1-y的平方=