50*360/2/3.1415926/4.107
    lg20
    20lg0.7
    8^24－8^23
    -108-（12）+23+18
    -2 4/3+（-3 3/2）+20 4/1-2 6/1
    （0.023/365）^365
    8^24-8^23
    2752-534
    （100000）/e-999
    （100000）/e999
    （1000000000）/e99999999
    1/πarctan1
    1/πarctanπ/4
    √222×222
    222×222
    46875*46875
    777*780
    91827/179
    5*53*937*37571

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