0.44-1.78x<2
    2-0.25x+1.89+0.44-1.78x>0
    2+0.25x-1.89+0.44-1.78x>0
    x>1*8+9
    x-1＞2x
    2x^2-x-3≤0
    0.3=9
    x-1>3 x+4>2x
    7>x*√x
    7
    x^2-2x+2>=0
    200x-(0.05x^(2)+60x+50000) >0
    0.2x-(0.05x^(2)+60x+50000) >0
    0.2x-(0.05x+60x+50000)>0
    （x+5）（x+2）≤0
    1.2*5+3>5+5
    (2.5x+3)*0.7>x+3
    （2.5x+3)*0.7>x
    (24×115.8×h+4×180×π×1.8×h+180×h×(12.6×2+10×2))/(10×(1335.95-1328.23+h)×115.8)≥1.15
    1+x<=3

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