20lg2
    20lg10
    0.47/(2+0.47)=
    (36000+36000)/(2×77143)=
    20lg1000
    20lg2000
    20lg30
    124.182×(1.358+7.1+3.3+5.714)+344.767×(2.349+1.4+3.3+5.714)+144.558×(0.675+3.3+5.714)+324.751×(1.536+5.714)+848.980×2.623
    3×10^4×600×600^3/12/5650
    2×3×10^4×250×400^3/12/2700
    2×3×10^4×250×600^3/12/7500
    3×10^4×600×600^3/12/5650=
    （7+1）%20=
    （14+1）%20=
    （13+1）%20=
    （12+1）%20=
    3×10^4×600×600^3/12/4200
    （10%/5）^10-1
    （45562.5+75349）/2*98182=
    45562.5+75349/2*98182=

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