1.02^x*0.98^(250-x)>1
    3x＋1＞x－3
    1.02^x*0.98^(250-x)＞1
    25x+15（150－x）≤2500
    (2-x)÷3+1≥x
    lnsinx小于lncosx
    lnsinx≤lncosx
    lnsinx＜lncosx
    3(x-3)≤9-(x+6)
    4+x＞4x-17
    cosx ≥0
    √cosx ≥0
    2x^2-x-2≥0
    2x^2-x-2≤0
    2*x＞5
    -4*(a+2)(a-1)>0
    4-a*a>0
    4-a*a<0
    x^3-12*x>-5
    (218n+18n^2)*(218.3n+12.5n^2)/(436+37.5n)+(1.75+n)*520-1.2[(91n+4.5n^2)*(182.2n+3n^2)/(364.4+9n)+(2.2+n)*719+(6.6+n)*220+55*(10.3+n)+(14+n)*17>=0

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