x^(2)+40x＝1100
    0.5+0.25+0.125+0.5^x=1
    0.5+0.5^x=1
    2^x=3160000000
    x^(2)+2x*8%+0.64%=1
    2^x=25000
    0.6556*x-13.27=ln(x)
    ((1050-1147)^2+(1100-1147)^2+(1080-1147)^2+(1120-1147)^2+(1200-1147)^2+(1250-1147)^2+(1040-1147)^2+(1130-1147)^2+(1300-1147)^2+(1200-1147)^2)/9=
    (1050-1147)^2+(1100-1147)^2+(1080-1147)^2+(1120-1147)^2+(1200-1147)^2+(1250-1147)^2+(1040-1147)^2+(1130-1147)^2+(1300-1147)^2+(1200-1147)^2=
    x^3+4x^2-4=0
    2x^3+8x^2-8=0
    2x*x*x+8*x*x-8=0
    X^(2)+2x*0.006164=0.999962
    0.12343323=x(3.68-x)
    0.0771325=x(3.68-x)
    1.7/x=2.5*ln(0.025*x/(1.006*10^(-6)))+3.5
    1700=1000*12%*(1+i)-1+1000*12%*(1+i)-2+1000*12%*(1+i)-4+1000*12%*(1+i)-5+1000*12%*(1+i)-6+1000*(1+i)-6
    （0.5）^x=1/1000
    （x-60）×（1-20%）÷800=0
    1+a^(2)>a^4

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