120÷（1+20%）=
    200÷(1-1/3-1/5) =
    3000+3000×3.25%×3=
    1÷(1/15-1/20)
    (1-1/8)：(1-1/6)
    E 0.25
    （4+5/12）-7/8+0.125
    1000/6.327
    1000/6.373
    1000/6.435
    1000/6.381
    1000/6.353
    1000/7.455
    1000/8.282
    1000/6.286
    1000/6.085
    1000/5.369
    1000/6.725
    7.6×84+76×1.6
    140/6

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