x=1.1-0.65×2.01/(0.0241×148.66)
    x=(911.15×10^6)/(0.87×730×9650.4)
    x=(1.0×14.3×1000×0.195×705)/360
    x=(1252.83×10^6)/(1.0×14.3×1000×705^2 )
    x=(91+940.49+1445.64+1379.76)/4-152.78×(16.252-2.34)/2-87.54×3.94/2
    x=1379.76/4-64.27
    x=(91+940.49+1445.64)/4-122.5×(13.5-2.34)/2
    x=1445.64/4-97.71
    x=(911+940.49)/4-89.5×(10.5-2.34)/2
    x=940.49/4-52.46
    x=22.75-41.1×(6.0-2.34)/2
    4x=91×(15.59-0.45)+940.49×(15.59-6.0)+1445.64×(15.59-10.5)+1379.76×(15.59-13.5)-580.8×(15.59-2.34)^2/6
    48（1+r）^(-1)+48(1+r)^(-2)+48(1+r)^(-3)+48(1+r)^(-4)+848(1+r)^(-5)=845
    4x=91×(12.96-0.45)+940.49×(12.96-6.0)+1445.64×(12.96-10.5)-465.36×(12.96-2.34)^2/6
    4x=91×(9.2-0.45)+940.49×(9.2-6.0)-300.8×(9.2-2.34)^2/6
    4x=91×(4.39-0.45)-89.2×(4.39-2.34)^2/6
    0.25x=91×(4.39-0.45)-89.2×(4.39-2.34)^2/6
    4x=91×(9.2-0.45)+940.49×(9.2-6.0)-226.92×(9.2-2.34)^2/6
    x=91×(9.2-0.45)+940.49×(9.2-6.0)-226.92×(9.2-2.34)^2/6
    48m+48m^2+48m^3+48m^4+848m^5=845

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