0.75×4.4×17.4+260=
    2079.24/(313.592-29.5)=
    0.7×4.4×17.4+260=
    220.5/2.9=
    46.44×1000000/(0.9×(650-0.096722)×360)=
    64.39×1000000/(0.9×(650-0.096)×360)=
    210631.337913/324
    264*cos0.5-132*cos(1.4-1.57)
    1000000/4.747631619816742
    -264*sin0.5+132*sin(1.4-1.57)
    -264*sin1+132*sin(2.8-1.57)
    264*cos1-132*cos(2.8-1.57)
    1/48×1.7×1.7×7.5×102.85=
    350.91-248.06=
    （3／14＋5／21）÷1／7
    arccos（-0.5）
    atan[(√3）/5]
    atan[(√3）/2]
    atan(√3）
    atan0.5

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