-265000+258544.74+1700.31
    -345000+344931.53+2875.64
    [(1+0.12)^14-1]/0.12
    220000*0.66+170000*0.66+17667*0.34
    -0.0004*42^6 + 0.0425*42^5 - 1.8895*42^4 + 39.545*42^3 - 391.63*42^2 + 1610.3*41 - 1811.2
    -133282-31575.3+91759.4×2+76956
    [55*（4/3）*3.14*（12.5*0.0001）^3*8.96]/55=
    1.2249*42^3 - 45.216*42^2 + 481.35*42-1128
    1.2249*41^3 - 45.216*41^2 + 481.35*41-1128
    tan(arccos0.95)
    !(0.12)/!(14)
    !(3)/!(1)
    0.08*40^(1/2)*400/250
    0.15*400*428.4*40^(1/2)
    -345000+347346.74+2875.64
    -265000+260355.07+1700.31
    0.55*0.9*40*400*428.4*1.376/(1+1.376^2)
    15740/(1.12)^15
    52040-36300
    52040*171404/25680

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