2X^3+17X^2+44X+32＝0
    （X-10）×（600+200 x）=8400
    （X+10）×（600-20 x）=8400
    X*（600-20x）=8400
    0.03x+97/102x=200
    x（45.59+x）=1100
    5x+9=29
    1000*x*(1－5%)=(190*1000+950000）*(1+20%)
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0
    （d^2+6d+13)*(2d+1）+(d^2+d)*(2d+6)=0

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