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
    360.1*0.03511/1.7
    (4.67*10^10)^(1/3)
    9.8*275*2.152^3*cos17*0.7014/435.5/2.975^2
    3.327322*1.202168
    lnx=4:x
    e^x=4:x
    16:e^x*lnx

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