156/125=(1/1.04)^(x-1)
    -x^3+x^2+5x+3=0
    x+5（x+6）=75
    156/125
    1500*[1-x]+1000*x = 876
    -x^3+x^2+5x+165=0
    1500*[1-(1/1.04)^(x-1)]+1000*[(1/1.04)^(x-1)] = 876
    1500*[1-(1/1.04)^(x-1)]+1000*(1/1.04)^(x-1)=876
    (0.021*x^1.85+462.25)^0.05*x^0.84=131.25
    (851.04+60)/876
    0.25x+x=10
    4k^(2)-k^(2)-1=0
    120a+350a=7200
    0.25x+x=10000
    X+X*0.03=1980
    40*((1-1.03^-20)/0.03)*1.02^20+1000*1.03^-20-1000*1.05^10
    169a^2-338a+144=0
    z^3-z^2-(0.003940692624205^2+0.003940692624205-0.007982298660754)*z-0.003940692624205*0.007982298660754=0
    z^3-z^2-(0.008116225313218^2+0.008116225313218-0.06446951202885)*z-0.008116225313218*0.06446951202885=0
    z^3-z^2-(0.004546687903565^2+0.004546687903565-0.04061017102653)*z-0.004546687903565*0.04061017102653=0

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