30000/(1+6%)*6%
    -lg（0.027）
    (1+sqrt13)/2
    274.32÷（28.3×10^(-6) ）×0.222
    （24226.8+534932.6）×10^(-6)×（22+223.3）×2
    3/7
    -750000+375000/1.08+600000/1.08^2+390000/1.08^3
    -1700000+1100000/1.08+900000/1.08^2+750000/1.08^3
    -2100+1500/1.1+1050/1.1^2+450/1.1^3
    -950+700/1.1+550/1.1^2+130/1.1^3
    9400-4500/1.2-3100/1.2^2-2400/1.2^3-1800/1.2^4
    9400-4500/1.1-3100/1.1^2-2400/1.1^3-1800/1.1^4
    2400*(1.5^2)
    0.45*90
    0.45*60
    0.45*120
    sqrt148
    sqrt289
    -0.078516×8.11×3.9^2=
    -0.114624×8.11×3.9^2=

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