(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
    0.78x²+29.09x-2.223=0
    0.78x²+29.09x-2.223
    0.78x²+0.1116x-2.223
    x²+58.2x-2.2
    1.6x²+58.2x-2.2
    1.56x²+58.2x-2.2
    0.78x²+58.2x-2.2
    0.78x²+58.2x-2.223
    0.78x²+5.818x-2.223

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