(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
    40x2-84x+27=0
    0.7×(3x-5)+0.6×(2x-5)= 0.6625×(5x-10)
    (x-73.34)/x=11%
    33x-10x=69
    sin（x）
    4x＾3-3x＾2-20=0
    10000*v=20000*v
    4＾3-3x＾2-20=0

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