247/36＝
    1/2＝
    1.5×16.7×785000×500×sin（1.29）×sin（1.29）×sin（1.29）÷3.14+360×4909×437.5×（sin（1.29）+sin（1.35））÷3.14=
    2.2-1.3*52/63+0.8*25/63
    2.2-1.3*52/63+0.8*25/63
    2.2-1.3*52/63+0.8*25/63
    11.4×0.6×0.6
    3+sqrt10
    3+2sqrt2
    tan（arccos0.6）-tan（arccos0.92）
    92142²-81085²
    81085²
    92142²
    92142²-81085²=
    92142²-81085²=
    7371²-6486²=
    7371²-6486²=
    7371^2-6486^2=
    1.95+0.87*0.87*12
    0.96+0.85*0.85*5.1

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