(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
    24+14.4+0.3*x=92
    24+0.3*x=92
    8.4+55.2+0.3*x=92
    10.2+52.8+0.3*x=92
    7.2+50.4+0.3*x=92
    15+62.4+0.3*x=92
    x+2=3
    50r2-30.38r3-57r+900=0
    10％ = 9％×（1/55％）×X/（1-9％×（1/55％）×X )
    10％ = 8％×（1/55％）×X/（1-8％×（1/55％）×X )
    29/992
    96÷x＋72÷0.6x=27

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