6≤sqrt(100+x^2)-x<8
    6≤sqrt(100+xx)-x<8
    720÷（10+8）
    3x^2-5x-2≤0
    (y-2)^2≥4(y-1)^2
    -8*x^2-21*x-9=0
    x^3-x^2-12x≥0
    (7%-X)/(X-8%) = (4.1002-4)/(4-3.9927)
    2x∧3－7x∧2＋2x＋3>0
    2x∧3－7x∧2＋2x＋3＝0
    950 +950*0.025 +950*0.035 -(950+x) -(950+x)*0.05-(950+x)*0.035<0
    950 +950*0.025 +950*0.035 -(950+x) -(950+x)*0.025-(950+x)*0.035<0
    x=3>0
    x^2+2x-2>0
    .09/1.15=.02/x
    2.87/0.036=x/0.028
    4.13/0.036=x/0.028
    4.13/0.036=0.028/x
    4（2x-1）<3（3x-5）
    3x-25<8x+11

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