0.14+2*0.014*20+2*0.0045*10+2*0.02*20+2*0.0042*50+0.15
    0.14+2*1.4*20+2*0.45*10+2*0.2*20+2*0.42*50+0.15
    (-1)+(-2)-(-1)×(-2)
    -1/2+1/3-4/5
    -(2/21)*(7/2)
    -(7/2)*(2/21)
    -(7/2)/(2/21)
    -7/2 / 2/21
    185×195÷25÷39
    -1089÷63×84÷121
    918÷85×(-125)÷270
    -84÷(-333)×(-888)÷56
    234×480÷(-208)÷108
    9.10-4.35
    283+(-149)
    -354+(-783)
    42×(-84)÷(-98)÷18
    (-143)÷169×39÷(-33)
    52×77-137×39
    （300-40-120）*3-280

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