(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
    arccos8.2
    log(3)
    log(3)
    2log(122500)
    -2log(2.51)
    -2log(0.00020215)
    log(4)
    log(2)+log(2)

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