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    175000000 = 13.8*300*a*(560-a/2)
    6000x+2500(100500-x)
    175000000=13.8*300*a*(560-a/2)
    25x等于75
    1600x=1280X(18-x)
    (x-1/11)=152-x
    757.2=40/(1+x)+40/(1+x)^2+800/(1+x)^2
    7x^2+99-90x=10
    x^5-0.4466x-0.2853=0
    x*x*2*4.5=3352.5
    x*x*2*4.5=13410/3
    10%=0.53×(1+x)÷16.20+x
    (1087.05+217.411+x)(1087.05+x)/(434.822-x)=27.18*100*10000
    (1087.05+217.411+x)(1087.05+x)/10000/(434.822-x)/100=27.18
    x+0.05x=3.99
    x+0.03x=3.99
    x*x*2*4.5=17880/3
    18.7^(2)+(r-7.2)^(2)=r^(2)
    x*x*2*4.5=17880
    x^3-3x^2+1

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