X/87+20/135-(72-X)/2000=0.33
    ln(1000000x)-x=0
    x=ln1000000x
    x*x+x=98000
    x*x+x=90000
    lnx=e
    √x-3x
    900*Q=1200+(560+12)*Q
    2x²-(1-x)²
    -x/2^2+140 x- 2600=0
    （60+x- 40）（150-X/2）＝5600
    tanx=3.2/27.3
    X÷300+36+X＝0.266%
    X÷X+101＝2%
    0.2*0.9659=0.197*sinx/(0.996*cosx+0.087sinx)+0.01+0.01*sinx
    0.2*sin75 = 0.197*sinx/cos(x-5)+0.01*(1+sinx)
    0.2*sin75=0.197*sinx/cos(x-5)+0.01*(1+sinx)
    0.2*sin75=0.197*sinx/cos（x-5）+0.01*（1+sinx）
    6/（10+x）=0.5
    1.8×4=1.8×1.8×2÷（1.8+m）²＋m×1.8×2÷（1.8+m）²＋1.8

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