0.120338799=0.19303*exp(-x/2.58372)+0.04844*exp(-x/25.7806)-0.000792402
    0.180535=0.17624*exp(-x/0.57053)+0.16986*exp(-x/5.67973)+0.01497
    x*(281.82*1.01^x-7.98)=3407.71
    x*(281.82*1.1^x-7.98)=3407.71
    5000/（1+x）^3+6250/（1+x）^4+6250/（1+x）^5+6250/（1+x）^6+6250/（1+x）^7=10300
    3（x-8）-6=2（9-x）
    0.074*sin(x)/cos(x-5)+0.01+0.01*sin(x)=0.01
    0.074*sin(x)/cos(x-5)+0.01+0.01*sin(x)=0.01
    0.074*sin(x)/cos(x-5)+0.01+0.01*sin(x)=0.01
    20/135+X/87-(72-X)/1000=0.285
    20/135+X/87-(92-X)/1000=0.285
    0=0.000189221*A^3-0.10683*A^2+25.28541*A-948.79813
    0=0.0002*A^3-0.0857*A^2+20.469*A-695.98
    （172.4535071*60^(x-1)）*10^(1-x)=96.2*e^(x-1)
    0=0.0002*A2^3-0.0857*A2^2+20.469*A2-695.98
    172.4535071*60^(x-1)*10^(1-x)=96.2*e^(x-1)
    (0.074*sinx)/cos(x-5)+0.01*(1+sinx)=0.01
    96.22905699*60^(x-1)*10^(1-x)=96.2*e^(x-1)*0.558
    cot^-1(0.6*tan(37.5)+0.025+cot75)=
    (100+x)÷(175+x)=0.618

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