tan66.2
    !(4655)
    tan66
    -1-(1-0.5)*(1/3)*(-(9/4))
    20(lg250-lg10)
    6×1.8+(6-1)×1.3+0.6
    4×(0.7291-0.25)
    9/7+5/8+7/16+5/7
    sin30+(3/5-sqrt2)^0-abs3-sqrt18
    8^3*(-0.125)^3
    4.2÷4/5
    1.8+2.4
    21/4*4/5-2.4
    100/（101.734+0.1558^1.15）
    100/101.734+0.1558^1.15
    2/9÷6
    (3(1/√2))^2
    0.57×0.011^1.54×0.011^1.77/0.088
    0.56522/(1-0.016)*0.016^(1.3/4.3)
    0.57×0.015^1.54×0.015^1.77/0.085

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