√((5×18696.6)/215)
    √((5×8339.45)/215)
    0.104×7.99×150^2
    176328.21/(160×138)
    (113.1×10^6)/2900-(-1271.9×10^3)/20
    (113.1×10^6)/2900+(-1271.9×10^3)/20
    113.1/1271.9
    (333.8×10^6)/2900-(-1271.9×10^3)/20
    (333.8×10^6)/2900+(-1271.9×10^3)/20
    (20×(510+70))/4
    333.8/1271.9
    arctan0.1
    arctan2
    arctan9
    42..66666*3
    42..6*3
    42..6*888
    12－34
    0.8*256=
    （1100－1129.86）/（1084.292－1129.86）

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