-x²+x
    x+5√（4-x）+8=0
    x+5√4-x+8=0
    224*(1-r^11)/(1-r)-224=1736.72
    (10-y^2)^2/y^2+y^2=25
    x+6＝1.5x
    5/6x0.2-x=1/12
    2/3x+50%x=210
    54*x+2/3*x+0.5x+11/12*x+5/12*x+5/6*x=124180
    396000*731=14.3*300*186*（360-186*0.5）+360*x*320
    2x^2-5x=0
    3q^{2}+24q-60=0
    0.2q^{2}+4q-10=0
    x^2=23
    9.5/87-40/1650-40/1000+X/131=0.00167（X+89.5)
    x²-2362x+182873=0
    （5.846-5.846/1.13*0.13+0.13）/6.88=X
    （7.064-7.064/1.13*0.13+0.15）/6.88=X
    （x+2）/(x-2)-16/(x2-4)=1
    8*cosx=3+4sinx

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