sinx+sinx/1
    sinx+sinx/1
    12-2a=27-5a
    1/sqrt(x^2-2x+2)-(x-1)^2/(x^2-2x+2)^1.5+1/sqrt(x^2-8x+25)-(x-4)^2/(x^2-8x+25)^1.5=0
    (x-1)/sqrt(x^2-2x+2)+(x-4)/sqrt(x^2-8x+25)=0
    arctan(1/2)+arctan(1/3)=pi/4
    5*n/100+5=100
    20*n/100+20=100
    0.75=0.5+(x-50)*0.05-30*0.05
    0.75=0.5+(x-50)*0.05-15*0.05
    lny
    lny
    x=ln1/x
    (x/340)-(x/4760)=3.4
    x/340-x/4760=3.4
    X^2+5x+25=0
    13.11x=7.98×(3.2+x)
    13.11x=7.98×(3.5+x)
    25t^2+20t=140
    22x+30（1/2x+15）=6000

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