x/25+200/x≥2√8
    x≥1080x^(-118)-146x^0.15
    x≥1080x^118-146x^0.15
    ((X-1200)/2000+1)*((X-1599)/15*115+900+2800+1400)>=6500
    2x＾2-3x<0
    (x-1)/(x-3)>0
    x＾2-16>0
    640x^5+2520x^2>2393680
    x(x+2)>x(3－x)+1
    x^2+6x+10>0
    x^2+6x+10>0
    x^2－14x+45≤0
    mx^2-mx-1＜0
    14－4x^2≥x
    3a＞5
    2*3(x+2)<5x+6
    x<2 x>0
    √x-x+12<0
    10x²-11x+3≥0
    abs(5x+1)>2-x

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