-1050+I-（1000-180-600+I）×8%/4-66≥500
    lnx+1
    1600*1.2x*（2.2/（2.8/1.4x））＞1600*1.2x*（2.2/（2.8/1.4x ））x<5
    （x²-1）/(2x²+1)-1/2<1
    -1/m≥2
    x^2-25x+100≥0
    60/x+40/x-40≤4
    60/x+40/x-40≤4
    x^2-65x+600≥0
    m<2 m+2>2 m^2-4m-4>=(m+2)^2-4(m+2)-4
    (x+1)(x+2)(x+3)>26x-2
    (x-25)(80000-2000(x-25))>=25*80000
    a-1<6<2a+4
    a-1<-2<2a+4
    x*x-4x-12<=0
    40-2x<=16
    20-3x<12
    x²-x＞0
    （1-y）＾2-4（y-2）（y-1）＞0
    X^3-19.21X-39.76>=0

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