4x(x-5/2)(x-5/2)-4=0
    (2√2-√2x)^2+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)^2+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)+(2√2)^2=(3√2-√2)^2
    x*x-49x+180=0
    1.00003ex=1.8
    (11+3)x+(15+5)(800-x)=13900
    K=2306.5+69.20+0.01K+38.18+0.0002K+482.78+0.0020K+0.0538K
    a^3－a^2＝－1
    arcsinx
    x（x+10）（x-10）=24000
    x^-3/2
    7600/x+10000/(x+112*0.2)+10000/x＝150
    （7600/（x+112*0.12)+10000/(x+112*0.32)+10000/(x+112*0.12)）＝150
    （7600/（x+112*0.12)+10000/(x+112*0.32)10000/(x+112*0.12)）＝150
    7600/（x+112*0.12)+10000/(x+112*0.32)10000/(x+112*0.12)＝150
    （7600/（x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)）＝550
    x+x²＝36
    32/x-32/1000=(32/500-32/x)*36/5

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