1.73x∧2+10.1x-1.73＝0
    x²-17x-1128=0
    x²+34.3x-1128=0
    x²+34.3x+1128=0
    X=12÷0.2
    X=12÷（1-0.5-0.3）
    5X-1X=16+8+24
    5X-1X=16
    5X-1X=1
    5X-2X=1
    X+9=14
    x²(x+0.01)=0.00000000000675
    (5.1-x）÷x=2.4
    （5.1-X）÷X=2.4
    0.88x＝54.52
    3x²+2x-5=0
    0.0713＝-0.0853x*x＋0.9557x－0.0379
    (-5/16)(x+3)(x-5)=5
    x/(-x^2+2x+3)=(-x^2+2x)/(3-x)
    (5547.8-y)/y＝2.4％

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