Mathematics
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    1*2.5*192+1.8*2.5*81+2.5*2.8
    68.40*.098
    57.15*0.98
    53.14*0.98
    arccos((35*35+46*46-900)/(70*46))
    arccos(35*35+46*46-900)/(70*46)
    arccos(35*35+46*46-900)/70*46
    1.1*89.925
    40*8-5
    35*8-35
    26.5*1000*25.55/330
    0.51*316.7
    {11×[(54.8-2×0.24)×(18.9-2×0.24)-2×0.08×5.8-2×0.08×5.5-2×2.8×5.8-2×2.2×(8.4-0.8)]-(272.35+4×256.95)×0.2}×0.02
    12*(0.3*6*7.45*4+0.3*1.85*7.4*4+0.3*1.4*7.4*2+0.3*5.9*3.5*19+0.3*1.85*3.5*20+0.3*1.4*3.5*10)
    8.15*3.7+6.2*3.7
    11*302.211
    12*302.211
    0.3*6.3*7.8*4+0.3*1.95*7.8*4+0.3*2.4*7.8*2+0.3*3.9*6.3*19+0.3*1.95*3.9*20+0.3*2.4*3.9*10
    0.3*7.8*47.1*4+6.6*0.3*47.1*4+0.2*8.15*47.1+7.8*0.3*3.6*10+5.9*0.3*3.6
    0.9*0.2*1.8*6+0.9*0.2*1*17

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