(4-t)^2=(3-t)^2+(1+2*t)^2
    3.14*x*(15.5*25*(0.8/x)^(1/5)+5*55*(0.8/x)^(1/3))+1/4*((0.8/x)^(1/3)*5800*3.14*x^2)=9000*2
    (4-t)^2=(3-t)^2+(1+2t)^2
    X^4＋12x＋3＝0
    2.4x-10+x=670
    x=1/2×28/3×7
    7x=6*(8/3+9)
    x=28/3-10/3
    x=sqrt(4+64/9)
    2x=8/3*7
    45*x^2-72*x-128=0
    x^3+x^2+x=0
    4x^3+15x^2+16x+6＝0
    x/11.3+x=140000
    5000+500x-100x-10x²＝8000
    5000+500x-100x-10x²
    x+10/60+x/90=1
    x^2+x+3=0
    x²＝(x+2)(x-1)
    40[150×(1-10%)]+20[225(1-a%)]=2000

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