limx(√(x2+1)-√(x2-1))
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f(1/x)=1+x2/1-x2则f(x)=x2+1/x2-1f(1/x)=1+x2/1-x2则f(x)=x2+1/x2-1f(1/x)=1+x2/1-x2则f(x)=x2+1/x2-1我来解等等令1
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x2-x1+{-(x2-x1)/x2x1}怎么分解成(x2-x1)(1-1/x2x1)x2-x1+{-(x2-x1)/x2x1}怎么分解成(x2-x1)(1-1/x2x1)x2-x1+{-(x2-x1
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