340*215+391*263+264*361+265*336
    (2*3.14/0.1)*sin(70/180*3.14)*(-1*0.1)
    (2*3.14/0.1)*sin(70/180*3.14)*(-0.8*0.1)
    (2*3.14/0.1)*sin(70/180*3.14)*(-0.6*0.1)
    (2*3.14/0.1)*sin(70/180*3.14)*(-0.4*0.1)
    (2*3.14/0.1)*sin(70/180*3.14)*(-0.2*0.1)
    (2*3.14/0.1)*sin(70/180*3.14)*(-0.05*0.1)
    0.3419+0.0858
    -3×0.286
    lg0.001
    1189*544*71/8
    47×552
    (8000/8) + ((((8000 + 1024) - 512)/2)/131072)
    ( 8000 ) / 4 + ((1024 - 512) / 262144)
    17.6×0.0550+18.2×(1-0.0550)=
    19.3 ×0.4306＋19.7 ×(1 -0.4306)=
    19.6×0.5098＋20×(1 -0.5098)
    19.3 ×0.4341+19.7×(1 -0.4341)=
    20.8 × 0.9007+ 21.1×(1 - 0.9007)=
    (8.002+64.559)/2×4.6

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