1800-702.739÷（0.13+0.000198X）=X
    (x-76.23)/x=10%
    4a*a+3a+2=0
    1800-504.5÷（0.13+0.000099×900+0.000099X）=X
    (x-8.27)/x=98%
    X^2-1800X+504.5=0
    1-(y^2/sqrt((1-y^2)^2+1.69y^2))=0.02
    1-(y^2/sqrt((1-y^2)^2+1.69y^2))=0.01
    (x-15)(-2x+90)=400
    3d²+20d+24=0
    -1/50×（x-10）²+9＝8
    -1／50(x-10)²+9＝2
    1=x
    56=4x^2+16x-x^4-4x^3
    56=4x^2+16x-x^4-4x^3
    4.5x－4.5－1.5x－0.75（x－2）=4
    sqrt3×x^2=sqrt32
    e^(-6*x)+6*x*e^(-6*x)=0.02
    e^(-6*x)+6*x*e^(-6*x)=0.05
    40x^2-84x+27=0

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