2t^2+3t-72=0
    （X-1284）*0.75/3270=(X-1752.8)*0.75/3000
    X-3=5-X
    x＝1.28（x-11.8）
    7*4500+5*(1-0.75x)*(1+2.5x)=(4500*7+2500*5)*(1-5x/11)
     (3x-x^2)/2 = ((X^2-3)/(3-x))^2
    (3x-x^2)/2=((X^2-3)/(3-x))^2
    299.7(10.1010-r) = （r+1000）*0.3
    (10000x+5000）*（0.97+x）*0.8=5588
    (10000x+5000）*（0.97+x）=6985
    x*x+6x+9=9
    t×t-28t+200＝0
    1.28x²+29.09x-0.86=0
    1.28x²+29..9x-0.86=0
    1.28x²+58.18x-0.86=0
    1.28x²+58.18x-0.85=0
    1.28x²+58.18x-2.223=0
    1.28x²+29.0909x-2.223=0
    -1.5t×t+60t-562.5＝0
    0.78x²+29.0909x-2.223=0

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