Mathematics
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    (243.61-9×10)×0.311-2×4.7×√0.311
    (275.74-10.7×10)×0.311-2×4.7×√0.311
    (96.96-5.13×10)×3.215+2×4.7×√3.215+5.13×10
    64.83+18.9×1.7
    (275.74-10.7×10)×0.311-2×4.7×√0.311+10.7×10
    243.61+18.9×1.7
    arccos1/2
    arccos1/2
    arccos0.958
    arccos0.958
    330+360+330+380+300+390+30+300+480+330+360+480+30+360+120+11+5+480+380+360+480+300+480+11+480+480+11+5+5+360+360+300+180+300+480=
    [—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

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