Mathematics
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    1.25×20×540.21
    2967.58-91.81-749.7-52.48-0.6×0.6×0.5×67
    8/1-(2/1-9/1)
    8/5-2/1-9/1
    5/8-(1/2-1/9)
    8/5-(2/1-9/1)
    8/5-2/1-3/1
    945.87+2×164.76+16
    (123.55+10.9) ×0.24×0.18
    1.2×1.5×41+0.7×2.1×19+0.6×1.5×1+1.5×1.5×2+0.9×1.5×3
    1.2×1.5×37+0.7×2.1×19+0.6×1.5×3+1.5×1.5×4+0.9×1.5×3
    1.2×1.5×34+0.7×2.1×10+1.8×2.1×4+0.9×1.5×1
    log(10)
    log(1)
    -2log(0.0001111)-2log(0.00020215)
    √16
    √2
    arccos0.7
    arccos0.7
    arccos8.2

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