(0.753906+(97/128))/2
    0.753906^3+0.753906^2-1
    ((97/128)+(3/4))/2
    (97/128)+(3/4)
    0.7578125^3+0.7578125^2-1
    0.765625^3+0.765625^2-1
    0.78125^3+0.78125^2-1
    0.8125^3+0.8125^2-1
    13/16
    0.875^3+0.875^2-1
    cos(70.7)
    （1+8%）^10-1/8%
    （1+8%）^10/8%
    e∧103.82
    e∧1
    4.2*150
    tan25
    1.2*1.2+0.8*0.8=
    1.5*7+2.5*7+10*8
    tan（-435）

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