292500000000^(1/2)=
    250000^2+200000^2+300000^2-0.4*250000*200000+1.2*250000*300000+0.5*200000*300000=
    (250000^2+200000^2+300000^2-0.4*250000*200000+1.2*250000*300000+0.5*200000*300000)^1/2=
    7/16*15+7/16
    -3/8*2.5^2
    sqrt(56.25)
    50000000*0.7-50000000*0.7*0.1+50000000*0.7*0.1*0.1=
    e18
    256^4
    （4000+1000+500+150+1000+500）/27*27-0
    -(3/2)*(7/2)
    [(-3)^2+(-2)^3]+[(16/5)-(48/25)-(32/15)]*(25/24)
    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）

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