问题标题:
∫(12)x根号下x^2-1dx∫(12)是它的上下标
问题描述:

∫(12)x根号下x^2-1dx

∫(12)是它的上下标

潘红回答:
  先不写上下标   ∫x√(x²-1)dx   =(1/2)∫√(x²-1)dx²   =(1/2)∫√(x²-1)d(x²-1)   =(1/2)∫√(x²-1)d(x²-1)   =(1/2)×(2/3)×(x²-1)^(3/2)   =(1/3)(x²-1)^(3/2)   带入上下标之后:   =(1/3)(1)^(3/2)-(1/3)(0)^(3/2)   =1/3
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