54.8*15.5*2.0+54.8*3*2.5=
    55.2*2.0*15.3+55.2*2.5*2.7=
    arccos(-3/8)
    6×4/1-（5/2+2/1）
    6＋1
    3.55*1026.72=
    55.2*18.6
    9.96*5.65*32=
    217.5+47.844+217.5+791.7+1374.66=
    3.273*30*14=
    3.625*7.8*28=
    2.215*2.7*8=
    3.625*7.5*8=
    689.472+590.976
    7.2*12*6.840=
    7.2*14*6.840=
    55957×2+70398×10=
    [-(3*(-1.313446)^2)+1-6*(-1.313446)]/[3*(-1.313446)^2+1]
    55943×2+61098×10
    221.616+1101.924=

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