0.3001=x^4-x^0.25
    （6x-7）:5x=1:2
    6xx-7x=11/2
    x²+x=68
    42x-0.2*6*10*3=3*25
    42x-0.2*6*10*3=1 2*6*25
    1/2*(3y+1.5)=1/4*(y-1)
    4x^3+21x^2+20x+8=0
    0.55X+0.6（500-X）=290.5
    4x^3+21x^2+20x+8=0
    4*x^3+21*x^2+20*x+8=0
    (5y+4)/3+(y-1)/4=2-(5y-5)/12
    t(8-2t)=4
    t(8-2t)=2
    2x^3—x^2=1
    sqrt(25*x^2+25)=sqrt(37)-sqrt(37)*x
    （6+10）h=50
    50-4x=42
    (a+4)12÷2=60
    (a+4)12*2=60

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