19×17/18×（-9）
    （19.8×1.5+20×1.8）×0.48+2×54×0.7
    （5/6-2/9+7/12）×（-36）
    138^(1/4)
    138^1/4
    24020.3 ^3/10000^3*10
    24020.3^3/10000^3
    log(0.3,2)
    0.2∧0.3
    2∧0.3
    （19.8×1.5+20×2.5）×0.48+2×54×0.7
     2×54×0.7
    19.8×1.5×0.48+2×54×0.7
    19.8×1.5×2.07+2×54×1.44
    （19.8×1.5+20×2.5）×0.48+2×19.4×0.7
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×0.22-2×20×0.47
    48×13/6
    48×5/24
    3╱37*3╱37*1╱2-5*3 ╱37-12
    0.3*0.038*0.038+0.5*0.002*0.002+0.3*0.052*0.052=

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