(60-x)(10x+100)=2090
    0.477＝2769.42/（a-53.26）-2818.21/（a-54.65）
    33 t^2+220 t- 42=0
    -5x^2+200x+880=1600
    -3x^2+24x-40=0
    -2x^2+24x-40=0
    (2x-3)^2=5(2x-3)
    x(x-1) = 156
    x^2-12x+35=0
    （25-x）（15-x）=300
    X^3-5X^2+6X-1=0
    13x+6+13+6+x=305
    9a^2-6a+1
    9a2-6a+1
    30x*3=60x+120
    60x+120=30x*3
    ((1/x)*log(x/1.45e10))-6.793=0
    800*X*X=6.667*6031*(1180-X)
    （X－3）×40%＋18＝X
    X－（X－3）=45

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