7*X^2+15*X+7=0
    sinx=0.69
    3x＾2-3x=15
    3849.55+3.62x=0.5*3.77*70x+（400+4*11.8*（x+1.95-3））*0.8*0.7*2.27
    0.04*10000 = x*[(1.04)^(10)-1]
    0.04*10000=x*[(1.04)^10-1]
    x=0.0033*(1-(x*510)/2.613)*(1-(x*510)/2.613)
    3042.193745*(1.005)^35
    x*[1-(1/1.005)^36]=100000*0.005
    (x-1)/2
    1/3=1/2(e(-3/4*sqrt(400/60/sinx)*(2.0944-x))+e(-3*sqrt(400/60/sinx)*(2.0944+x))
    2x+5小于等于3（x+2)
    1:3:1:4
    -(1-x)*(1-x)*lnX=0.11
    -(1-x)*(1-x)*lnX=0.03
    2x=lnx
    4x＝1
    x-1/2
    0.75:x=0.2:0.8
    2x-5小于等于3（x+2）

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