4*27.51
    （0.47*2）+2.34
    0.5/64
    2.5/64
    6*4/3
    0.44+1.07+9.38
    0.5/68
    0.5/28
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96*0.13-119.26*13.26-188.36*9.26-791.27*2.35-36.9*0.13
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96*0.13-119.26*13.26-791.27*2.35-36.9*0.13
    2.5/16
    36.79*8.73+109.31*6.56+16.28*4+164.03*1.99+61.46*0.37-119.26*7.96-188.36*3.96
    0.5/44
    160*0.125*1/2+248*0.125*2/3
    36.79*8.73+109.31*6.56+16.28*4+164.03*1.99-119.26*7.96-188.36*3.96
    （450
    36.79*8.73+109.31*6.56+16.28*4+164.03*1.99-119.26*7.96-268.40*3.96
    5.5^3
    62.033/50
    14/((0.1*1.1^8)/(1.1^8-1))-35-35*(1/1.1)^4

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