x+9/x=4
    x÷11.3+（8-x）÷7.9=0.84
    2x(444x)=55.963
    （X-985.32-5000）*0.03=X-6354.7-985.32
    （X-1125.32-5000）*0.03=X-11604.7-1125.32
    （X-1125.32-5000）*0.03=X-11604.7
    x/（x-32)=2
    x^4-4x^2-x+2=0
    C（22，4）
    (2127-x)×（1.8-0.04）×0.41＝749
    1.8×0.41×0.96x＝749
    1.8x＝1471
    1.8×0.41x＝749
    92.96=（（0.021*x^1.85+22.7）^0.5）*x^0.84
    34.5=（（0.021*x^1.85+11.5）^0.5）*x^0.84
    x=-0.5（0.5-1）²+3
    -0.5（x-1）²+3=2.6
    -0.5（x-1）²+3
    12x/16=10
    40r^2-3r-36=0

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