x^2+3x-1/8^14=0
    20723*1.45*1.4*300/(300+406)*2+20723*1.45*300/(300+406)+64720*0.2
    a*1.45*1.4*300/(300+406)*2+a*1.45*300/(300+406)+64720*0.2>64720
    25/7
    57.522-46.75
    52/7
    1.05^x=0.5623
    1/(1+i)
    1i
    0.25*0.32
    sqrt(31.8^2+(54.57-2.94)^2)
    sqrt(35.94^2+(54.57-6.1)^2)
    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

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