（20+19.4×3.00+18.7×1.0+17.8×2.4）×0.687
    (54.444×4.174+14.833×2.808+151.051×1.843+90.315×0.952+2.837×0.245)/(6.8+0.367-1.6)
    0.367-0.367/3
    (15.463×0.367)/2
    ((41.631+44.383)×2.1)/2
    ((41.631+44.383)×2.4)/2
    (（48.332×2.4×2.4÷2+29.212×2.4÷2×2.0÷3）)/151.051+0.4+0.367
    (（15.680×1.9×1.9÷2+25.949×1.9÷2×1.9÷3）)/54.444+1.0+2.0+0.367
    (（9.559×1.0×1.0÷2+10.547×1.0÷2×1.0÷3))/14.833+2.0+0.367
    (44.383-2×9×1.625)/(18.2×(2.642-0.378))
    44.383-2×1.205×12.0
    (（48.332×2.4×2.4÷2+29.212×2.4÷2×2.0÷3）)/151.051+0.4+0.300
    (（48.332+77.544）×2.4)/2
    (（48.332+72.652）×2.4)/2
    (（9.559×1.0×1.0÷2+10.547×1.0÷2×1.0÷3))/14.833+2.0+0.300
    (（15.680×1.9×1.9÷2+25.949×1.9÷2×1.9÷3）)/54.444+1.0+2.0+0.300
    (41.631-2×9×1.625)/(18.2×(2.642-0.378))
    1-(1/4+3/8+3/10)
    5/10-2/10-1/10
    5/10+2/10+1/10

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