x^2+2x+2
    x^2+2x+2
    1000-1500x=400
    0.75-（x/125）^0.714*0.75＝0.39
    0.75-（x/125）^0.714*0.75＝0.45
    0.6×（1＋g）/12＋g=11%
    0.6×（1＋g）/12＋g=0
    1-2x/1+2x
    x＾3-2x∧2-144=0
    1650/2.5x*70*2.2＝300000
    1650/2.5x*70*2.2
    1650x/2.5*70*2.2=300000
    300000/9.55/π = 110x-0.1824x^2
    30000/9.55/π=110x-0.1824x^2
    600000=110x-9.55π*0.1824x^2
    x＝720+0.2x
    0.7x+0.3x＝9
    0.7x+0.3x＝9
    (66+x)*3355-1700*(59+x)=30*(66+x)(59+x)
    xsin1╱x

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