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
    0.78x²+58.18x-2.223
    0.78x²+58.18x-26.44
    0.78x²+58.18x-13.22×2
    0.78x²+58.18x-103.2427
    0.78x²+58.18x-13.22
    0.78x²+0.05818x-13.22
    X*0.09+X=118
    X*0.09+X=99

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