2X1+X<=1200 3X1+4X2<=2400 x1+x2<=800 X1-x2<=450
    2a^2+60小于等于26a
    a^2大于1
    2x+3>6-2
    x(6x+5)<4
    1+2x^2/x^4+1<=2
    (1-4/7x=(1-40%)(x+18)
    1.5(130(1+x)) = 130(1.5(1+x))
    x+x/3>10
    x+x>5
    9x+4>10
    3+x<5
    6
    5*x^2+10*x-3>0
    1-4*1*（-m）>0
    234 >x^2+233.99
    234>x^2+234
    2/（x-5）=300
    2/（x-5）<300
    sinx<0

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