3000*（1+5%）*（1+1%）*（1+2%）
    0.01/1000
    25*3600^4+(4634/6)(3600-1200)^3+(2910/6)(3600-2400)^3-(2510/3)*3600^3-25(3600-2400)^4
    cos70
    log(0.95,0.8)
    200*（1+15%）*8+{250-200*（1+15%）}*6
    2.83×1/2×2+18.85×1/2×2+0.7×1.53×（9.0-0.7）×1/2×3×25
    72.83×（1/4×2+1/2）+64.44×1/2×2+0.9×1.53×（9.0-0.7）×1/2×3×25
    √(2/3)
    537.03-134.25
    537.03×25%
    20000-19462.97
    16871.08+40+32.54+475.00+800+200+1000+21.85+22.50
    2.05+30.49
    3.43*500*6
    0.2272+0.9822+0.5644+1.6643
    16.67×4.10×300
    0.2272+0.9822.0.5644+1.6643
    1.6643*80*6
    16.67×0.00726×300×1000

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