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- 3因式分解(3m+n)(2m-n)-(m+3n)(n-2m)
- 4数学题用导数法求y=x^3-6x+9在[-1,4]上的值域.
- 5Mrs.Richard is take of his coat.
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- 7已知定义在R上的函数f(x)满足f(x+5)=-f(x)+2,且当x∈(0,5)时,f(x)=x,则f(2013)的值为_________
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- 9描写人物的词语有哪些
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