a*a-5a=24
    130.86=-8.314*298*lgx
    7x＋7＝9(x－1)
    7x＋7＝7(x－1)
    0.15=lgx
    x^2+2x=1
    100.4=（（0.021*x^1.85+239）^0.5）*x^0.84
    73=（（0.021*x^1.85+239）^0.5）*x^0.84
    7.1=（（0.021*x^1.85+239）^0.5）*x^0.84
    1+y+y^3 = 3
    X/126-(95-X)/1000=0.392
    x^2=0.2805
    sqrt（x）=0.2805
    sqrt（x）=0.6805
    sqrt（x）=1.122
    lgx=1/20
    x=cos39
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.538
    sin(x)=2sin(3x-π/6)
    sinx=0.72

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