X/(X+15)=77.94%
    x^4+4x^2=100
    8x-8=4x+4
    x=1.077×9.8×9.3×10-2×4.4×10-2/[(4×3.141592)×44.37×10-2]×0.6962
    8x-8=4x-4
    1.1^x=5
    （25.759+x）×0.85＝51.519+67.078-x
    （25.759+x）×0.85＝51.519+68.078-x
    （25.759+x）×0.85＝51.519+69.078-x
    （25.759+x）×0.85＝51.519+70.078-x
    （25.759+x）×0.85＝51.519+70.078-x
    （25.759+x）×0.85＝51.519+71.078-x
    （25.759+x）×0.85＝51.519+71.078-x
    （25.759+x）×0.85＝51.519+72.078-x
    （25.759+x）×0.85＝51.519+72.078-x
    25+x＝97.402-x
    5x+x➗5=52
    5x+x=52×5
    6x^2-x-1=0
    5x+1=4.7(x+1)

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