29.376 *[1 + (0.04*0.50)]=
    28.80* [1 + (0.04 * 0.50)]=
    29.952 *[1 + (0.04*0.50)]=
    29.952 *[1 + (0.04 x 0.50)]=
    28.80 (1 + 0.04)
    840000*90%/(840000*90%-151200)
    [-3.5]
    cot90
    9x+4（100-x）=[10x+6x（100-x）]（1-25%）
    0.5*1.32^(-0.5)
    1.32+0.5*1.32^0.5-0.75-0.375*1.32^(-0.5)
    0.68+0.5*0.68^0.5-0.75-0.375*0.68^(-0.5)
    40*0.9x+15*0.1X=14838*0.40
    40*0.9x+15*0.1X=14838*0.38
    43*0.9x+15*0.1X=14838*0.37
    43*0.9x+15*0.1X=9832*0.59
    43*0.9x+15*0.1X=9832*0.56
    0.02x^2-0.45x=10.99
    0.02x^2-0.45x=9.25
    0.02x^2-0.45x=10.93

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