8×0.30+9×0.25+9×0.30+8×0.15
    40×30%+35×60%+30×10%
    【(300-120)×480-120×45428】
    (300-120)×480-120×45428
    (59.2+6)×5%×(1+5%)×(1+11%)
    (59.2+6)×(1+5%)×(1+11%)×20%
    (59.2+6+8+5)×(1+5%)×(1+11%)
    (200+300)×380/10000×1.1655
    300×380/10000×1.1655
    (300×380-500×380)/10000
    9-5/9
    1.7*29+17
    2÷1/5*4
    5/6÷30
    7.3*10%
    1÷3/5*5
    0.5*50%
    4.2÷0.6
    (203.65×10^6)/(1.0×11.9×1000×680^2 )
    15/5/6

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