1-2x>-6
    0.3x*0.3^x*0.7^(x-1)>0.95
    0.3n*0.3^n*0.7^(n-1)>0.95
    x-x*2%≥1640
    x*x*x-x>0
    （x+2509)/130>X/104
    （x+2509/130）>X/104
    sin(x)*sin(7x)>1/4
    2x+8>3x+7
    x+1<5
    2x-7＜3(x+1) 4/3*x+3≥1-2/3*x
    5(x-2)≤28+2x
    5(x-2)≤28+2x
    3-2x<15+3x
    9-4x<2x
    5-4x=4<2x
    12x+20>-11x-49
    4x-21>5x-6
    -√3÷2≤sinx＜-1÷2
    (4/3)*(8-2*x)*（8-x）*54<1*10^(-6)

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