18^3
    18^3=
    0.484655+0.909*(0.472-0.46)-0.425*(0.742-0.46)*(0.472-0.47)-0.33333*(0.472-0.46)*(0.472-0.47)*(0.472-0.48)
    0.484655+(0.472-0.46)*0.909+(0.472-0.46)*(0.472-0.47)*(-0.425)+(0.472-0.46)*(0.472-0.47)*(0.472-0.48)*(-0.33333)
    78÷5
    （4-4/5m*m+24/5m-4）*5-10-m（4-4/5m*m+24/5m-4）/2-（5-m）（4-4/5m*m+24/5m-4）/2
    10^11/21600/21600/6.67*30*3.1415
    30*3111955200*3.1415/10^11
    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

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