(（2263.7-X）/2263.7)*100=0.2
    （2263.7-X）/2263.7*100=0.2
    （2220-X）/2220*100=0.7
    （2218-X）/2218*100=0.7
    5450=35x-30x
    （754.6-X）/754.6*100=0.3
    （766.8-X）/766.8*100=0.3
    (1/6)x^6+(1/2)x^2-x=0
    （766.8-X）/766.8=0.3
     （54.4-x）^0.75 = 0.517*（x-40)
    800x*x-44719516+31581x
    (42.309+x)×1.75＝72.918+42.309-x
    x^1/3(X-1)
    1.11*0.57*x*1.81=1.26
    X=7÷（1-0.4-0.35）
    x=5*8
    x²-9=16
    -x²+20x=100
    9（1+x）²=1
    √x÷326/2π＝1.5

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