（lnx+1）（x∧2-1）-（2x∧2）lnx＝0
    70（10-y）+150y=1200
    (5046+X)/(6080+X)=0.94
    -3x^2+60x-320=0
    x/(x＾2-x+1)=7
    0 = -2222.2x6 + 4000x5 - 2722.2x4 + 866.67x3 - 132.56x2 + 16.933x - 1E-15
    -x^2+5x-2=0
    5-2x＝12-12x
    1.8775=（0.285+0.005x）x^(3/2)
    42x^2－61x＋25＝0
    0.016x+4.213=0.05836x+0.07407
    0.06x+4.213=0.05836x+0.07407
    0.06301x+3.275=0.2029x+0.09974
    3x-4=40
    (420000000-250000x)(200000000-200000x)-40000000000000000=0
    10-y=20.6
    (420000000-250000x^2)(200000000-200000x^2)-40000000000000000=0
    3*x^2+14*x+10=0
    x+x+2+18-(x+x+2)=18
    (420-250000x^2)(200-200000x^2)-40000=0

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