(25.31×700)/(0.874×384)
    16.2/（0.8×0.8）
    1.2×6.5+1.4×6
    80×（1-32%）
    1379.97+251.028+1633.783+669.312+4336.865+1517.903*0.5=
    1633.783+1338.624+3644.856+2109.8*0.5+1430.244+1329.696=
    97^17
    97^5
    97^10
    97^17
    1323.54+1280.448+1633.783+1569.696+3644.856+0.5*2109.8=
    0.35*4336.865=
    4.224*1026.72=
    1*100*10*65*0.001
    100-35
    6/0.1
    （-2）^2
    （-1/2）^2
    -1/4^2
    -7^2

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