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
    2.84/71
    0.01*115
    3.99-0.01*60
    2*0.003/20/0.1*1000
    24.55*0.02*5/25/0.049
    24.55*0.02*5/25/0.0049

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