1/2-35*1/84
    40/(1/70)
    251035698139091.15625/16/17/18/19/20*88*87*86*85
    3743464.752598*92*91*90*89*88*87
    7503063898176000/!(15)
    7503063898176000/!(20)
    100*99*98*97*96*95*94*93*92*91*90*89
    !(100)
    C(100,20)
    e-0.3
    2 000×（1+8%） -1
    sqrt(4)/2
    sqrt0.4|4
    sqrt9
    4^1/2
    （-√7）^2+9
    3乘以3/4
    3-3/4
    78×6×83/348
    25×〖2.5〗^2/2

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