[30+（30+n-1）]×n÷2≤1200
    [30+（30+n-1）]×n÷2≤1200
    -4*a^3+a^2-2*a+1>0
    2≤6x^2≤3
    2≤6×x*2≤3
    2≤6x*2≤3
    6.2x^2-621.8x-27378>=0
    x+1/2＜2
    x-1≥3-x
    278x>5000sinx
    278x<500sinx
    278x<5000sinx
    x/sin(x)<500
    x/sin(x)<50000
    x/sin(x)<5000
    77.2x<2sin(x)
    77.2x<100sin(x)
    x+0.5+0.5+x/2+0.5+1＜9
    1.544x<100sin(x)
    (x/2+0.5)+(x/2+0.5)＜9

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