61-9*3
    9*4/6
    25/5*8
    60-12/6
    6*7+3
    7+6*4
    7/7*3
    28/4*6
    4*9/6
    12+79-62
    81-45+36
    54-21-18
    (3.14×2^2)/4×(0.3+1.5)+(3.14×（0.285）^2)/4×10.18
    ((24-0.3-1.5)×11)/24
    (41.69+4.8×0.3025)/0.3025
    41.69/0.3025
    41.69/(0.15×0.15)
    1.1×[1.0×(1.77+2.12+0.103+0.39+0.13+39)+1.0×(2.5+0.78)]×0.9×0.9
    (54.78×10^3)/(0.608×574)+(0.107×10^6)/7784
    1.1×[1.3×(1.77+2.12+0.103+0.39+0.13+39)+1.5×(2.5+0.78)]×0.9×0.9

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