-1*（1-X^2）/（1-x）＝0
    -2*（1-x^2）（1-x）＝6
    37y^2+20y-23=0
    （3.45+1.5*x）*x=1.2*3.4
    （3.45+1.5*x）*x=1.2*5.48
    16+x²=4x²
    （1.82+1.5*x）*x=1.2*1.9
    （2.01+1.5*x）*x=1.2*1.86
    （2.43+1.5*x）*x=1.2*2.71
    （3.45+1.5*x）*x=7.8/12.5*5.48
    3x-9+2x+3=7x+11-5x-8
    （0.57+1.5x）*x=1.83*1.2
    （0.97+1.5x）*x=5.33*1.2
    （0.68+1.5x）*x=2.6*1.2
    （0.57+1.5x）*x=1.83*0.4
    （0.97+1.5x）*x=5.33*0.4
    （0.68+1.5x）*x=2.6*0.4
    （0.68+1.11x）*x=2.6*0.4
    0.813*(f+f-0.48)+1.341*(f-0.48+f-11.57)+6.060*(f-11.57+f-15.00)=6*140*195*2/1000
    1.603*(f+f-0.94)+0.399*(f-0.94+f-6.31)+6.060*(f-6.31+f-9.79)=6*140*195*2/1000

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