3X=5600/2
    3X=5600
    -5t^2+12t＝2
    5t^2+12t＝2
    25+x＝33.13+150.556-x
    x^4-12x^3+45x^2-54x+16=0
    x^4-4x^3-3x^2+14x+8=0
    s^2(s+6)=(s+4)(3s^2+12s)
    s(s+6)=3*(s+4)^2
    (x+1)^4-(2+2*2+2)(x+1)^3+[(2+2)(2+2)-1](x+1)^2+(2+2)(x+1)-2*2=0
    s(s-3)=(s+1)(2s-3)
    3s^2*(s^3+4s^2+5s+2)=s^3(3s^2+8s+5)
    s^3+4s^2+5s+2=0
    30*（390-a）-9a=7410
    1.2a+0.88（80-a）=80
    2X²-3X-1＝0
     x+2x+(x+2x-15)=65
    3x+2x+(x+2x-15)=65
    （175/9）x^4+20x^3-374x^2+1620x-2025=0
    (X-60)(220-2X)＝1200

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