34*2.71+221.29*cos28-42.54-50.23*sin28*tan30
    27*(0.906245*9.704087-0.598173)
    1.5*5+0.5*4.408174
    27*((1-(tan28/tan80))(1.5*5+(1/2)*((5^2)/tan80)-(0.5*1.5^2*tan28))
    0.5*9.81*3.2^2
    0.5*9.81*3.2*2.71
    (5-3.73)/sin28
    -3*-1/4+0.25*24.5+-7/2*1/4
    sqrt992
    124*8
    32^2
    sqrt436
    （-81）×（2.25）×（-4/9）/16（-3/4）^2
    （6/5）/（8/15）
    log(1/3,2)
    4.6*4.2
    3.78/4.2
    2.52/4.2
    3.52/4.2
    1/1+1/2-1/3-3/4

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