0.13×650/1.57×25
    0.13×650/1.89×25
    0.13×650/1.89×32
    120/20
    12/20
    （1.5+1.2+18+2.3+3）*3
    (101-(101-3.168))/ln(101/(101-3.168))
    (101-96.75）/ln(101/96.75)
    1÷97÷256
    1÷97÷256
    1÷97÷256
    1÷97÷256
    0.677×(8.83×600^4)/(100×9350×8333330)
    1.0×[1.0×(0.75+0.49+36.4)+1.0×(2.5+4)]×0.2
    0.677×(9.35×600^4)/(100×9350×8333330)
    (0.55×10^6)/166667
    0.1×11.51×〖0.6〗^2+0.177×2.15×〖0.6〗^2
    1.0×[1.0×(0.75+0.49+39)+1.0×(2.5+4)]×0.2
    1.1×1.3×(0.75+0.49+39)×0.2
    0.677×(46.25×200^4)/(100×9896×281250)

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