(2*9.8*0.725*(sin(45)-0.12cos(45)))^(1/2)
    37.2^2*sin(28.2)/9.8
    (1/((1/(149*10^9))^2-((1/(298*10^9))^2))^(1/2)
    (1/((1/(149*10^9))^2-(1/(298*10^9))^2))^(1/2)
    -2*(-2)+6*2
    7^3/30
    20+20
    1-2/5÷5/7
    5/13÷6/13-1/3
    44/3+1/35÷3/35
    14 2/3+1/35÷3/35
    43870806.131214/(3141285.261*34)=
    (34*43870806.131214)/3141285.261=
    e∧0.31444
    e-0.31444
    100／1173／1073／8.314
    8.8/2.2
    5.7/3
    -ln(0.550463)
    0.28÷5.22

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