(14/5)/[√(14/5)]
    [(-1-1)^2+(-1-1)^2+(2-1)^2+(2-1)^2+(3-1)^2]/5
    2lg5-1+3^log(3,7)+lg4
    sqrt-9
    arccos（0.78）
    (50+50)*0.88/1.52+35*0.88/1.77+25/1.92+25/1.92
    131.9*3
    3415.5*3
    √210
    e^(-1)*(-1-1)-(-1)+1
    e^0*(0-1)-0+1
    16.499671*0.108
    35.14e(−0.756)
    18--63
    63*-1.25
    (4*30+3*30+3*30+3*30)+(3*22+2*22+2250)
    35-48+15
    (2*25+3*30.5+3*29.5+2*24.5)+(2*23)
    (2*25+3*30.5+3*29.5+4*24.5)+(2*23)
    (3*30+5*25+4*30)+(3*22+65+4*23+3*23)

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