√30*√2
    838.48×[（1+0.0435）1-1]
    （838.48+30）×0.03
    36*12.9*6.31+6*4.088*4.83
    15*(20+1.289)*4.83+15*(21.019+1.289)*4.83+11*4.115*4.83
    15*(21.119+1.189)*4.83+15*(21.019+1.289)*4.83+11*4.115*4.83
    A(2,100)
    C(8,10)
    A(8,30)
    (43.9+35.1)/2/100*1.78
    (43.9+35.1)/2/100
    sqrt((4-(28-8sqrt(6))/5)^2+((-6+6sqrt6)/5)^2
    sqrt((4-(28-8sqrt(6))/5)
    arctan8/5
    85*5.94*2.98+85*5.94*1.58+50*12.75*1.58+154*0.48*1.58+25*0.7*2.98
    20.3*((14.11+13.58)/2-1)
    !(11)/4
    !(11)/45
    114*514
    1+1+4+5+1+4

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