sqrt436
    （-81）×（2.25）×（-4/9）/16（-3/4）^2
    （6/5）/（8/15）
    log(1/3,2)
    4.6*4.2
    3.78/4.2
    2.52/4.2
    3.52/4.2
    1/1+1/2-1/3-3/4
    8.4/32
    sqrt(82109)
    abs-5
    9^17
    9^30
    9^32
    9^9^2
    1523*(1/14)^(0.4/1.4)
    14^(0.4/1.4)
    1-(1724.47-137.72)/(3458.7-137.72+(3458.7-2550)*0.1757/(1-0.1757))
    1-(17244.47-137.72)/(3458.7-137.72+(3458.7-2550)*0.1757/(1-0.1757))

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