abs[(4/7)-(2/5)]-abs[(3/5)-(7/9)]+abs[(2/9)-(3/7)]
    49/256-7/8+3
    4.184(-1.4867+74.339*298/1000-39.065*(298/1000)^2+8.0543(298/1000)^3+0.01219(298/1000)^-2)
    8.314*298/101325
    800256+36*2442.2
    2442.12*18
    50016+2*18/16*2442.2
    44597+2442.2*（11*18/142）
    90-arcsin（1.31×sin（90-arcsin（sin（80）/1.31）））
    sin(π/2
    lg2.19
    3.15^1/3
    6.3/2
    21/19
    sqrt(4.8)
    1.43/3
    （3*（2.7+3+1.7+4+2.3+1.7+3.3+2+2.7+2.7）+2*（1+3.7+3.7+2.3+3.3+2.7+2.7+4）+1*（3.7+3.3+3.7+4））/50
    sqrt(2.6)
    lg1.43
    sqrt(2.03)

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