10m+8(10-m)>=75
    x^3-12x^2-32x+384>0
    1/250>=(3/4)^n
    4x-1/x>0
    （13-2x）*x>6
    （2x-19）-2（2x-19）-19-2＜2（2x-19）-19＞-19＝0
    2+x≥3x(2-x)
    100x+400*5+65(400-x)-400*75≥9600
    ((a-1/(4a))^2)/4+(1/(2a))^2<=1
    ((a-1/4a)^2)/4+(1/2a)^2<=1
    2x + 5 < 4(x + 2） x - 1 < 2x / 3
    2x >= -9-x 5x - 1 < 3(x +1)
    1 - 3x ≤ 2x - 9 5 - x > 2
    (x - 6)/5≤（x + 3） /2 -1
    （x + 5）/ 2 - 1 < (3x + 2)/2
    30(1-10%)(50-y)+40y≤1500
    -x^2+x+1<0
    x^2+x+1<0
    x^2+x+1>0
    100-x＜200-3x 100-x＜160-2x 160-2x＜200-3x

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