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
    1/120＋1/120÷01/10000
    0-0-0.0
    100-70
    0-0
    888888888888^2023=
    1-0
    19890604-3.0
    26%÷5200

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