10.5+0.28*4+0.32*1.5*2
    105*0.03*500
    0.2*500*5
    （500/15+1）*2=
    －2.3470*2
    61^2
    log(10,2)
    log(10,0.3)
    sqrt9=
    4.609594-（12-3*4.609594+2*cos4.609594）/(-3-2sin4.609594)
    3-（12-3*3+2*cos3）/(-3-2sin3)
    80÷1.07+80÷1.07^2+1080÷1.07^3
    4-7/8=
    4-4/2=
    （6％+5％+3％+4％+5％）÷5 + 1.2%
    （6％+5％+3％）÷3+ 0.8%
    【（6％+5％+3％）÷3】*100%
    （6％+5％+3％+4％+5％）÷5
    5÷（(1+6%)*(1+5%)*(1+3%)*(1+4%)*(1+5%)）-1
    5÷【(1+6%)*(1+5%)*(1+3%)*(1+4%)*(1+5%)】-1

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