（25.759+x）×1.95＝51.519+69.078-x
    （25.759+x）×1.75＝51.519+69.078-x
    （25.759+x）×1.55＝51.519+69.078-x
    e-(3.14x/sqrt(1-x^2))=0.2
    arctan(sqrt(3)/(2-x))+arctan(sqrt(3)/(4-x))=60
    arctan(sqrt(3)/(2-x)+arctan(sqrt(3)/(4-x)))=60
    9(4-3x)/5=4x(5x-12/5)
    1/（x^4+1）
    （25.759+x）×2.55＝51.519+69.578-x
    （25.759+x）×2.35＝51.519+69.578-x
    （25.759+x）×2.15＝51.519+69.578-x
    （25.759+x）×1.95＝51.519+69.578-x
    （25.759+x）×1.75＝51.519+69.578-x
    （25.759+x）×1.55＝51.519+69.578-x
    (200+10y)(64-y)=14400
    （12-（12*（3*sqrt3-1）/13）-2x）^2=0
    2.4y-9.8＝1.4y-9
    40x-5x^2=28.8
    x^2+2sqrt(5)x+2
    3000/10x+3000/12x=10

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