arctan150/270
    1.25/30*40
    1/e
    3+3-3/3+61-18/2
    3-3-3-3-3-2+9/9-1=
    3-3-3-3-3-2+9/9-1=
    sqrt(-1)
    33/3/1/1-2+2-2+1
    2+2+2-2+2+3-1
    38-9-9-8-7
    √5-5
    9000+130*0.7+196=
    720+（180-50）*0.9+280*0.9=
    4500+（600-4500*0.12）-25-800-216=
    (100*3000*3000)/(100*100*50*150)
    (100*300*300)/(100*100*50*150)
    17×5
    1+2
    arccos77
    √（4*0.00614）/√（3.14*1.2）

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