7.7+4.5
    9.7+3.5
    (2.7-1)/(1+0.905)
    0.888/0.387
    5.5/14.2
    0.888/0.402
    5.57/13.83
    5.5/14.2
    (2.65-1)/(1+0.859)
    (2.65-1)/(1+0.859)
    arccos0.25=
    (2×5.57×10-9.9)/(2×9.9)
    2÷√3
    2-√3
    1-exp0.2477
    1372.86*4
    1098.89*5=
    785.36*7=
    16.6%+1
    2.7%+1

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