1.m -m m X=3 +1,y=9 +(1/3) ,试求y与x的函数关系式2.已知:a+x方=2005,b+x方=2006,c+x方=2007,切abc=24,求a/bc+b/ac+c/ab-1/a-1/b-1/c的值3.证明:a/(a-b)(a-c)+b/(b-c)(b-a)+c/(c-a)(c-b)的值与abc无关.4.已知A=4567890123/5678901234,B
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