60*（1-20%）
    6630/（1+2%）*6/13
    12357/70611
    70611-58254
    598% / 26% =
    -11(3/2)(0.12(-12)) =
    (-17) - (-22) =
    4(-2)² + 8(-2) + 3(-2) + 6 =
    (3^5^5)^1999
    3^5^5
    sqrt0.000692
    ｛（-0.01575-0.0203875）^2+（0.0177-0.0203875）^2+（0.0585-0.0203875）^2+（0.02110-0.0203875）^2｝/4
    （-0.01575-0.0203875）^2+（0.0177-0.0203875）^2+（0.0585-0.0203875）^2+（0.02110-0.0203875）^2
    2/13：5/39
    13/13/12*3/4
    10lg(50)=
    180-90-arctan(sqrt(2))
    99:60
    0.69*4/11
    0.8+0.2*(-0.55)

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