9.8(cos(45−x)+0.65sin(45−x))>0
    X+7大于100 X-7小于90
    X+7大于100 X-7小于90
    5^1/x大于0
    1093200－50000－450000－X≥300000
    0＜x*x*x-x-5
    (1800x+1040*0.05-721.555556)*3.5*1.085*1.2*0.8＜(1800+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8
    (x+1040*0.05-721.555556)*3.5*1.085*1.2*0.8＜(1800+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8
    (x+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8＜(1600+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8
    (x+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8＜(1800+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8
    (x+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8＜(x+1040*0.05-721.555556)*3.5*(1.085*(1+0.01x))*1.2*0.8
    (x+1040*0.05-721.555556)*3.5*1.095*1.2*0.8＜(1665+1040*0.05-721.555556)*3.5*1.085*1.2*0.8
    4≥4
    4≦4
    4≦3
    abs(x+1)-abs(2x-3)＜0
    -3<2x-1<3
    -3<2x-1<3
    1＋x＜5
    1＋x＞3

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