网上看到一道题（下图）：当 x 趋向正无穷时，请证明 y 等于 90。想了半天，没解出来。最后还是看了答案。https://www.symbolab.com/solver/limit-calculator/%5Clim_%7Bx%5Cto%5Cinfty%7D%5Cleft(%5Cfrac%7Bx%7D%7B2%7D-%5Csqrt%7B%5Cfrac%7B%5Cleft(x%5E%7B2%7D%5Cright)%7D%7B4%7D-90x%7D%5Cright)
https://twitter.com/ruanyf/status/1361312201986826242
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