(50+0.4y)/(0.85-0.00026y)>0
    (0.85*x-50)/(40+0.026*x)>0
    (50+40y)/(0.85-0.026y)>0
    60x+150(100-x)≤9800
    2x²-x-3≥0
    1+18*n>(80-n)*18
    x²-8x+16＞0
    x²-8x+16≥0
    x²-8x+16＜0
    x²-8x+16≤0
    x²-2x+1≤0
    x²+3≤4x
    x²+2x+1≤0
    x²≥16
    9−2a>1 6−4a<−22
    −33<=−12−7k<−26
    6-abs(2x)<=2
    abs(4-2x)<=6
    abs(6-2x)>=8
    m+√(m^2-24)＜-2

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