0<4x-78<10
    x^2-10x+20≥60
    x^2-10x+20≥50
    x^2-100x+2000≥100
    x^2-100x+2000≥45
    x^2-100x+2000≥50
    x^2-100x+2550≥50
    sina>0
    sin(a^2)+2(a^2+2a+1)≥0
    sinx>cosx
    (lg(x^2+1)+4x)(lg(4x-1))<(1/7)(cosx+sin(2x-1))
    9x^2+cosx+sqrt(x)>0
    (7-5)/5>0.55
    x+1-2sqrt(x)≥0
    x+1-3sqrt(x)≥0
    x+1-sqrt(x)≥0
    （500-（x-50）*10）*x-8000≤10000
    （2X+1）（X－4）＞＝－9
    （m-30)(40-m+40)>=525
    544+172n/851+472n<0.5

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