[—6/1+（-1+2/1）-（-2/3）]×24
    15-（-23）+（-48）
    10％*7.9％
    10％+7.9％
    3.14*(300/157)^2
    62.75/55.84*100%
    tan0.45
    tan0.86
    arccos0.9
    (421.02×3.66+113.97×5.46)/(31.68×0.72+290.68×3.44+95.90×5.45)
    (421.02×4.66+113.97×6.46)/(31.68×1.72+290.68×4.44+95.90×6.45)
    (421.02×4.66+113.97×6.46)/(31.68×1.72+290.68×4.44+95.90×6.45)
    (19.9×0.2+18.9×3.6)/58.0
    (18.9×3.43)/53.8
    50（20-10）
    (19.9×1.2+18.9×2.3)/45.0
    (18.9×3.8+18.9×0.7)/65.0
    (18.9×3.43+18.9×0.7)/60.8
    0.892/0.375
    4.2/11.2

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