21600*21600*6.67/10^11
    6*3600
    -2/3(1-19/3)^2+24
    -2/3(12-19/3)^2+24
    cot45
    (1.5*0.715)-2*(0.715)^3+2*(0.715)^2-(31/24*0.715)-0.2
    1.5*0.715-2*0.715^3+2+0.715^2-31/24*0.715-0.2
    （6^3-5.7^3）*4/3*3
    6^3-5.7^3
    12^3-11.7^3
    x∧2-60x+875=0
    （x-20）（-2x+80）=150
    -2x+120x-1758
    （x－20）（2x+80）=150
    log(2,0.25)
    log(2,3)
    log(3,0.125)-log(2,0.25)
    11.65/233*96
    x^2-9x-30
    0.04*55

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