7.2*72000
    56332.8+2444997.6
    33.741*1.035
    32.6*1.035
    32.6*0.035
    33.1705 *[1 + (0.035 * 0.50)]
    32.6* [1 + (0.035 * 0.50)]
    33.578*[1 + (0.035 * 0.50)]
    32.6* (1 + 0.03)
    28*[1 + (0.035 * 0.50)]
    28 [1 + (0.035 x 0.50)]
    1.5×0.5×0.4
    (x-400-200)*(1-25%)/8000=（x-400-450）*（1-25%）/7000
    2+(0.589*(4.88*10^10)^0.25/(1+(0.469/0.7014)^(9/16))^(4/9))
    9.8*275*2.152^3*0.7014/436.5/2.975^2
    2+(0.589*(18.4*10^10)^0.25/(1+(0.469/0.7296)^(9/16))^(4/9))
    2+(0.589*(2.3*10^10)^0.25/(1+(0.469/0.7296)^(9/16))^(4/9))
    9.8*275*1.076^3*0.7296/435.5/1.562^2
    7x(2x－1)－3(4x－1)－2x(x+3)+1
    1968减x等于1588

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