（25.851+x）×2.15＝51.702+69.853-x
    （25.851+x）×1.95＝51.702+69.853-x
    （25.851+x）×1.75＝51.702+69.853-x
    （25.851+x）×1.55＝51.702+69.853-x
    （1+x)*(1+2%)=1+2.5%
    x+0.75x-13625.8=0
    (s+2)(s^2+6s+25)+s(s^2+6s+25)+s(s+2)(2s+6)=0
    a^2=16a+64
    y*(0.019+y)/[(0.981-y)*(0.019-y)]=0.2826
    2/x+1/(x+20)=1/(x+2)
    x*x/(1-x)=51.42
    s^2(s+20)=(s+2)(2s(s+20)+s^2)
    2x^2+46x+60=0
    2a+3=0
    2x+5=6
    1.5x²+14＝10x
    1.5x²+14＝10x
    0.5x²+14＝10x
    10-5（2x-1）=15（x+1）
    10*a-10/a=48

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