72.8+72.8*cos(75)
    72.8+72.8*cos(30)
    72.8+72.8*cos(128.29)
    72.8+72.8*cos(124.7)
    72.8+72.8*cos(120.1)
    72.8+72.8*cos(91)
    72.8+72.8*cos(73.5)
    72.8+72.8*cos(105)
    72.8+72.8*cos(120)
    (42.3%^2×0.60%^2+57.7%^2×0.55%^2+2×57.7%×42.3%×0.60%×0.55%×0.80）^0.5
    72.8*cos(105)
    72.8*cos(120)
    1 + 100
    3*5=
    1／2.7+1/3
    975343546.842567+854256467.85
    1e＋1e
    1.8e＋2×7e＋6
    1.8e＋7e
    7.9+42/9+66.16

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