（38-x）（160+120x）-22（160+20x）=3640
    x÷lnx
    x÷lnx
    x^3-16x^2+32=0
    x^3-16x^2+32x=0
    （x-24）*0.75/700=（x-40)*0.75/500
    2x/3x+4=8/13
    （x-24）*0.75/700=（x-4)*0.75/500
    2x/2x+x+4=8/13
    26x=24x+32
    2x/2x+x+4=8/13
    sin x*tan x
    x*x*x=1.728
    700+（1+x）^2=1008
    (X-3)2+4X(X-3)=0
    -1/12(-2-x)^2+3=2.25
    2sinx+cos2x
    (4136.8+2.8782×10^10/（361^0.5×x×（x+80.3706））)×（x-80.3706）＝8314.73×361
    (4136.8+9.4749×10^9/（361^0.5×x×（x+49.9925））)×（x-49.9925）＝8314.73×361
    8X-24/25X-40=4/1

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