√9
    3500/[400+80*3+3500]
    2135*2.3*3.2
    2135*2.3*1.2*3.2
    6246*1.6+3400
    599*3.5/1.6
    599/1.6*1.75*0.85
    -9/4
    3-5
    sqrt6*sqrt2
    [（sqrt(6)+sqrt(2)）/2]^2
    C(39,1)*C(39,1)
    1/2+1/4+1/8
    685*2.38*2*1.15/1.55
    685*2.38*2*1.15/1.5
    685*2.38*2*1.15
    5+8+9+6
    1+9
    e(-2.804967)
    125.60÷55.72

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