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)
    51/92.0
    51/92
    2.15-0.28
    -0.51*51/92
    0.46*51*51/92/92
    1.58*0.04
    1.58*0.32
    1.58*0.64
    0.32*(-4/11)
    0.44*4*4/11/11

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