Overview: 1 questions will be solved this time.Among them
           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation (640-(10000/d^2+320))-4.26*(（1405625/d^4+3779）^(1/2)) = 0 .
    Question type: Equation
    Solution:    This equation has no real solution!

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