（25648−5158.4×5.13658）/107.206
    （120592−22811×5.13658）/107.206
    （120592−22811×5.13658）/107.206
    （120592−22811）×5.13658/107.206=
    5470* √0.75/125
    80/√3
    A(10,5)
    C(4,2)
    √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)

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