2x-x^2>=0
    2x-3≤-1
    -（2x-3）≥1
    2x-3≥1
    2-3x≤7
    -（2-3x）≤7
    45.99+0.78*(x+188)/2 > 188-5.29
    45.99+0.78*(x+188)/2 > 188
    x^2-2x-3≥0
    1÷（3-x）≤0
    x^2-x＜6
    0.2*0.95^x＜0.10
    0.2*0.95^x≤0.10
    0.2*0.95^≤0.10
    60x+24(100-x)>=3120
    360x+324(100-x)>=3120
    360x+324(100-x)<=3120
    （3x+2）×（5x+3）^2×（3x-1）≤0
    （x^2-4）÷（x+4）≤0
    （x-1）×（x+5）^4×（x-3）≤0

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