31.6÷(7.9一5.4)÷0.4
     (58.3+25.7)/(160*0.25)
    (58.3+25.7)-(160*0.25)
    6.32*0.99+6.32*0.01
    6.32×0.99+-6.32×0.01
    375*99
    1.7*((1.3+2.15)÷0.6)
    1.7*[(1.3+-2.15)÷0.6]
    6/7-(3/14+3/7)
    -5/-6
    -5/6
    1.6/66
    ln1
    abs3
    abs-3
    （5+5）-5/5
    （5+5）/5
    12 / 0.3
    3 / 0.3
    5286583592462865%－6586296689548545%

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