sqrt（1）
    15000(1+x)[(1+x)^10-1]/x=60000
    X^2-6x+9>0
    dy - +y=xy dx
    90+45cos(x^2/18)=100
    x=0.0001(1-x)
    x-16% ➗ x-17% = 10.63-14.27
    6.5*s^2+15*s+6=0
    x+3/7＝3/4
    160*0.015*（4*x）^0.667=（0.0002^0.5）*（2*x^2）^1.667
    11*0.005*（3.6*x）^0.667=（0.005^0.5）*（1.6*x^2）^1.667
    (x3+x2-2)/x2-1
    10x+1.5x^2-18.353=0
    x*x+0.865x+0.865=0
    50=x/(1+0.06)+x/(1+0.06)^2+x/(1+0.06)^3+x/(1+0.06)^4+x/(1+0.06)^5+x/(1+0.06)^6+x/(1+0.06)^7
    x^3-x^2-3x+12=0
    5-3x=8x+1
    83*0.4+0.6x=82.2
    (x/176)+(1.049-x)/397.5=0.00508
    x*195-x*10=900

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