6㏑1－3
    6㏑1－3
    8㏑2
    -7+13-6+20
    arcsin(sqrt(7)/4)
    arcsin(sqrt(7)/4)
    arcsin0.75
    arcsin0.75
    7/8/8/9/0/7
    83.6×0.64×0.6=
    tan（-7.853982）
    12×0.6×0.6=
    28.5×0.64×0.6=
    51×0.64×0.6=
    17×0.64×0.6=
    69×0.64×0.6=
    69×0.6×0.6=
    20/(4/5)
    20*(4/5)
    40*120%

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