-40+X-0-X*0.01-20 >50
    -40+X-0-X*0.01-20>50
    -40+A-A*4%/4-20≥50
    A-0.01A≥110
    ( 8 - ( ( x - 2.5 ) / 0.1 ) × 0.2 ) * x > 20
    {8-[(x-2.5)/0.1]×0.2}x>=20
    (8-x-2.5/0.1×0.2)x>=20
    x²+2x-3≥0
    x(x-１)≥０
    x²≤1
    (5X-3)÷(2x+5)≤0
    (5X-3)÷(2x+5)≤0
    (5X-3)÷(2x+5)≤0
    x²≥1
    （x-1）²（x+3）＜0
    2[(2k-1)/4]-3[(3-4k)/2]>0
    7-2*(x+2)<5
    (4x-33)/3-2*(x-4)<-1
    -2a-4<0
    9*x^2+6*x+1≥0

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