780＋29
    1645－865
    667＋2808
    234×12
    523＋245
    3661÷7
    3611÷7
    3611÷7+245
    3123÷9
    721-324
    40×30%×8/5
    220×【（5.5/500）-1】
    220×（5.5/500-1）
    （4600+4330-1000-980-150-130）/2
    100+100+500+460+2850+2660
    （2350+2250）/2
    （4600+4330-1000-980）/2=
    tan5
    arcsin0.05
    C(40,24)*(1/2)^40

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