-6x^(2)-x+2≤0
    -x^(2)-2x+3
    x^(2)-5x-6
    x^(3)-6x^(2)-6x+28=0
    x^(2)+5x+6
    X^(2)-42X-88=0
    -6x^(2)-x+2
    X＝2X
    15i(((1+0.75i)^20-1)/0.75i)+12i(((1+0.75i)^9-1)/0.75i) = 64
    -107sin（1.23x+0.841）+90=3.34
    -107sin（1.23x+0.841）+90=-3.34
    100 = 29.75x^2+0.7858x-0.0022
    50= 29.75x^2+0.7858x-0.0022
    10 = 29.75x^2+0.7858x-0.0022
    5= 29.75x^2+0.7858x-0.0022
    1 = 29.75x^2+0.7858x-0.0022
    0.1 = 29.75x^2+0.7858x-0.0022
    0.01=29.75x^2+0.7858x-0.0022
    （20/（6.1*6.1*21））+（20/0.043）（（1/6.1）-（1/x））=（62.2/0.43）（（1/x）-（1/6.55））
    arctan(x/5) = 90

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