4/15*5/7+2/15*4/7
    （4/5）sqrt（5）
    0.79/(1+e^(1.118-0.094*(-2)))
    0.79/(1+e^(1.118-0.094*2))
     ( 2 / 3 * -21 / 5 - 4 ) - ( 2 * -21 / 5 - 3 ) / 5
    （5/3）^(4/3)
    （2/3）^(1/3)
    （2/3）^(4/3)
    1/(91/5-2.4/2)-3
    221^2-121^2
    3.7* 3.7+12.6* 3.7+6.3*6.3
    （-5）^4*（-2）^5
    -10lg0.33
    784/4-98
    784/4-48
    (548+212)/5
    35*18/7
    5*5*5*5
    131.6/28
    64.9/11

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