2sinx+3cosx=3
    lnT-αlnm-βlnk=lnB lnT=0.06 lnk=1.94 α=0.5027 β=-0.4952
    40/(x*sqrt(1+0.04*x^2)*sqrt(1+0.005^2*x^2))=1
    lnT=lnB+αlnm+βlnk lnT=0.06 lnk=1.94 α=0.5027 β=-0.4952
    x^3-6x^2-15x+100=0
    (13-x^2)/(x+1)*(x+(13-x)/(x+1)=42
    X-14%X=3
    （2x^2+17x+8）^2＝（4x^2+16x+25）（x^2+16x+64）
    (x-1)/(x+1)+(x-4)/(x+4)=(x-2)/(x+2)+(x-3)/(x+3)
    12x^3+216x^2+1152x+1472＝0
    10000/（x+10000）＝0.163916
    e^(x^2）+x+1=0
    √(2x-4)=√(x+5)+1
    √(2x-4)=√(x-3)+1
    26^2=16x^2+(26-3x)^2
    1.0*14.3*250*127=360x
    2000*0.12＝2800－x*0.1*2800
    ((sin2x)/6.28+(3.14-x)/3.14)^0.5 = 0.5
    1.4x*0.8＝x＋270
    1.8*10^8=1.0*14.3*250x*（460-x/2）

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