Mathematics
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    31*870+13*310
    7000+100-421.33
    =60%
    =60%
    =60%
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/(18*2000+15*1500+12*1000)
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/(18*2000+15*15000+12*1000)
    (18*0.6*2000+15*0.6*1500+12*0.6*1000)/18*2000+15*15000+12*1000
    5000/(12*200+10*500+9*600)
    (12-9)*200+(10-6)*500+4*600
    3*5
    -5-7
    cos-1/2
    7-(-5)
    2.4×3.5+6.5÷1.3
    1.84÷2.3×0.65
    18÷0.36÷0.25
    2+9
    e6000
    ln2

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