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    (1800000-1÷0.256)/(1÷0.256+200×1÷0.256+1÷0.256)
    (100000-1÷0.256)/(1÷0.256+200×1÷0.256+1÷0.256)
    (1800000-3.90625/(3.90625+200×3.90625+3.90625)
    x/(106.8+x)=0.4
    13*13*10/4
    13*13*10
    13*13
     (300-10x)(x-10)
     (300-10x)(x-10)=840
    Dur=(100/1.08+(2*120)/〖1.08〗^2 +(3*1200)/〖1.08〗^3 )/1100
    (100/1.1+(2*100)/〖1.1〗^2 +(3*1100)/〖1.1〗^3 )/1000
    (1080/1.08)/1000
    (120/1.09+(2*1080)/〖1.09〗^2 )/980
    (100/0.1+(2*100)/〖0.1〗^2 +(3*1100)/〖0.1〗^3 )/1000
    (1080/0.08)/1000
    32 2 2
    x^2-60x+600 = 0
    Arctan2sqrt(5)
    2X-2=25-X
    52.61*(1+18%)*(1+18%)*(1+18%)=

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