5（x-1)>(3+1.1)(x+1)+1.65
    x+3>1 2(x-1)<=4
    x+3>1
    8×（0.2-x)>27×(0.3-x)
    27×（0.2-x)>8×(0.3-x)
    0.82x+1.15>1+x
    0.82+1.15x>1+x
    x+4/3-3x-1/2大于1
    8(x+1)>100
    x^2<1
    1-x^2>0
    1-x^2>1
    9-x^2>=0
    -1<=x+1<=1, -1<=sinx<=1
    -1<=x+1<=1 -1<=sinx<=1
    -1<=x+1<=1
    -1<=sinx<=1
    -1<= x+1 <=1
    (2x+1)(x-2)>0
    2x+1>0

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