40/0.04*[1-(1/1.04^40)+1000/(1.04)^40
    15÷5/3
    15÷3/5
    cos7.7
    134.377896*cos23.4*cos6/sin6
    134.377896*sin23.4+1120=
    (15.9×(5.8×15.4+24.71×10.1)/15.9)/((6.3-0.5+15.9)×10)
    (15.4×(5.6×15.4+24.71×9.8)/15.4)/((6.3-0.5+15.4)×10)
    (15.5×(5.4×15.4+24.71×10.1)/15.5)/((6.3-0.5+15.5)×10)
    ((5.6+9.9)×(5.6×15.4+24.71×9.9)/(5.6+9.9))/((6.3-0.5+15.5)×10)
    ((5.6+9.9)×(5.6×21.7+33.1×9.9)/(5.6+9.9))/((6.3-0.5+15.5)×10)
    (1431.15×12.48)/(1485.64×10.001)
    (4.63×1.05+1385.50×10.001)/(1385.50+4.63)
    2/3×14.4×(2×8.16+184.27)/(8.16+184.27)
    ((8.16+184.27)×14.4)/2
    (741.21×11.59)/(773.85×7.23)=
    (4.63×0.2+749.33×7.27)/(4.63+827.81)
    (4.63×0.2+827.81×7.27)/(4.63+827.81)
    1/2×150.51×11.0
    (1395.94×12.48)/(1421.54×10.004)

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