18*（22.47-20+1.27）-120*8%
    18*（22.47-20+1.27）-120*4%
    1.16131975^(1/3)
    1.14821545^(1/3)
    1.526028^(1/3)
    （3438.502798-980*3）/980*3
    980*3*1.071*1.045*1.045
    （55/800*800/529*30/55）/（1-0.056711）
    55/800*800/529*30/55
    55/（267.5-55）
    16.52%+（16.52%-7.31%）*43.93%
    16.52%+（16.52%-7.31%）*44.21%
    16.52%+（16.52%-6.57%）*44.21%
    16.61%+（16.61%-6.57%）*44.21%
    78+45-28-32-39+15+24-21-78+66
    78+45+28+32+39+15+24-21-78+66
    78+45-28-32-39+15+24-21-78+66
    78+45-28-32-39+15+24-21-78+66
    78+45-28-32-39+15+24-21-78+66
    24*1500/（24*1500+16*2500+18*500）*25500

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