8.995*1000*(0.00013^0.5/3)1.9
    8.995*1000*(0.00013^0.5/15)3.5
    8.995*1000*(0.00013^0.5/10)2.4
    0.012*（92.9+12）/92.9*7.87/7.8/100
    (2*√21-2)/10
    (2√21-3)/10
    (√21-3)/10
    √856
    13+(3/8)
    sin22.8
    √30.25
    4.5^2
    1÷3*3
    1/3*3
    2800/28*14
    2800/30*14
    8/（53+17-10）
    53×0.2
    (0.07-0.00011)*(92.9+12)/92.9*7.87/7.803/100
    (0.012-0.00011)*(92.9+12)/92.9*7.87/7.803/100

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