(x-4)[500-10*(x-5)]=4100
    （x-30）[600-10*(x-40）]=10000
    x^2+1=145x/12
    x*0.975*0.95+567=1500
    120X-27000-120X*5%=8100
    sin(2x-5π/6)
    x^2- 15.5x + 59.6=0
    65435656=10^9*a/(6.25-a)/(12.5-a)
    65435656=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=a
    65332488=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=10^9*a/(25-a)/(12.5-a)
    (0.25)*(2*x^4-4*x^3-6x^2+8x+12)=0
    3y-1/4-1=5y-7/6
    3(x+3)+x=2x-4
    log(2,x)=100000000
    x=tanx
    x+1/（x-1）
    （15140+200+x）*2.2%=4x
    （15140+200+x）*3.3%=4x

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