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最佳答案:令2x=uy=x^(u)y'=ux^(u-1)·(u)'y'=2x·x^(2x-1)·2y‘=4x^(2x)
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最佳答案:g(x)= 1/(x+1) +2g(x) -2 = 1/ (x+1)y'= y-2,x' = x+1即:y' - y= +2,x' - x= -1向量a= (