e^sinx
    0.827x-0.094sin(2πx)-0.099=0.21(sin(πx))^3+0.0388sin(πx)+0.0388sin(1.25π-2πx)
    20*ln2=-2^(t-13)
    10*ln2=-2^(t-13)
    (t+94.61-129)*ln2=-2^(t-13)
    4-√(16-x^2)=√(4x-x^2)
    √(4x-x^2)=4+√(16-x^2)
    100x-（580+40*100）-（100x*0.13-5*100）*12%=0
    （39.402+x）×2.2＝39.402+71.604-x
    （39.402+x）×2.5＝39.402+71.604-x
    （39.402+x）×2.5＝39.402+72.104-x
    （39.402+x）×2.35＝39.402+72.104-x
    （39.402+x）×2.2＝39.402+72.104-x
    （39.402+x）×2.05＝39.402+72.104-x
    2=0.1*[（a*a）/4]
    0.949x-0.107sin(2πx)-0.1159=0.21(sin(πx))^3+0.038sin(πx)+0.038sin(1.25π-2πx)
    x^3-2*x^2+4=0
    (1.11^(1/0.22))*x*(1-0.22/2.22*x^2)^(1/0.22)=1/40
    x^2-22x-80＝0
    1210*t+100*(120-t)=123000

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