2cosx=xsinx
    tanx=2/x
    2+x+2+x+2=10
    [sin(x+30)]/[(sinx)(sin70)]=(sin60)/[(sin20)(sin40)]
    [sin(x+30)]/[(sinx)(sin70)]=[sin60]/[(sin20)(sin40)]
    (sin(x+30))/(sinx)(sin70)=(sin(60))/(sin20)(sin40)
    X^2-0.25X-13/2=0
    x*x-16*x+64=0
    5x^2-28x-33
    5x^2-14x-33
    X^2+3x+9=0
    24x/30=1.2x+60
    16X^2-375x-625=0
    4.9338=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    4*x^2-9*x+3=0
    X*（1500-330）-500=0
    (2+2*x)^2/((2-x)*(3-3*x)^3)=4/27
    X^2+3x-1=0
    x*0.975*0.95=3000
    t^2+9t-23=0

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