1400×13
    1.6*(12.5-1.25-0.125)
    8.7除以（2.5*2.9）
    123.086/547.21
    19.21×0.6+55.78×2
    6÷7/12
    (1215.0-223.12)/(19.21+528)
    58*(1+1.8%)/(18%-1.8%)
    68*(1+1.8%)/(18%-1.8%)
    ((19.21+528)×0.6)/55.78
    360.19*79.5%=
    360.19*20.5%=
    1215/223.12
    47.2*(1+1.8%)/(15.14%-1.8%)=
    18%*79.5%+5%*20.5%*(1-19%)=
    19.21×2.78+528×2.2
    627*(1+1.8%)/(18%-1.8%)
    19.21×4+528×2.2
    -10-5
    -10+5

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