1/(1+0.0425)^3
    1/(1+0.0426)^3
    (1+0.079)^2/(1+0.082) -1
    1/1.0395^2
    45*(1000*0.2)+50*(1000-1000*0.2)*0.8+50*0.8*100
    0.25*0.128*32
    5.65-4
    x+(5.1-x)=5.1
    （x+3）^2=64
    X^2-169=0
    X^2-109=0
    1+X=3
    y∧2－1700y＋640000=0
    2*（1.2*0.6+1.2*0.8+0.6*0.8）-1.2*0.8
    2*（1.2*0.6+1.2*0.8+0.6*0.8）-1.2*0.6
    468*a-12*a*a=1296
    a*a=39*a-108
    4x^3=5.3×10^-9
    4532/(573-298)
    5.67*0.8*（573^4-298^4）/10^8

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