sin(0.513113209)*(3*cos(0.513113209)-2)/(3*cos(0.513113209)^2-2*cos(0.513113209)+2)
    ((12+2*23)+sqrt(76*23^2+60*23))/(2*(9+6*23))
    42*（5/7+2/3-1/2）
    3∧8-3∧7+3∧6-3∧5+3∧4-3∧3+3∧2-3
    3＋971.19 / (846.02×9.81)
    0.49×(5.856×0.2839)^-0.245=
    =0.1805×0.37+0.63×0.3447
    =0.5633×(1-0.1805)/[0.1805×(1-0.5633)]
    =0.5633×(1-0.0.1805)/[0.1805×(1-0.5633)]
    =(64.98+99.93)/2
    1.215×0.001314-0.0002304=
    1.215×0.006115-0.0002304=
    1.215×0.027-0.0002304
    1.215×0.109-0.0002304=
    1.215×0.334－0.0002304=
    0.692×0.628+0.3=
    0.692×0.872＋ 0.3=
    （6.7930-6.8350-1）×100%−1.58%
    2abs-(-1)
    2abs(-(-1)

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