4/5 - 4/11+1/5+7/11
    e^（-0.3）
    −3e(−0)
    2019-1-2-3-4-5-6- ... -19
    √5
    √13113456196
    (3/4)
     (2*1.3/0.3*461.89*673*0.68)^0.5
    (2*1.3/(1.3-1)*461.89*673*(1-0.75^(1.3/0.3)))^0.5
    (2*1.3/(1.3-1)*461.89*673*(1-0.625^(1.3/0.3)))^0.5
    (2/2.3)^(1.3/0.3)
     -25*3/2*3/2
    5 /2/3 * 3/2/ ( 1/5 )
    3999.38*(934000-2*10^6*0.0025)-4299.38*(930750-2*10^6*0.002326)
    5乘8/15
    6乘7/20
    5/6乘36
    0.556:80
     5/9 :80
    2.5:1.25

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