3[y-2(y-7)]≤4y
    2(x-1)-x> 3(x-1)-3x+5
    2(3x-1)-3(4x+5)≤x-4(x-7)
    3x-2(9-x)>3(7+2x)-(11-6x)
    x+8≥4x+1
    -2x-1> 0
    2x+19<7x+31
    43x+3>1
    x²-x-6＜0
    3^x>1
    x²-2x-8<0
    x²+2X+1>0
    4m× m+4m<0
    cosx大于等于0
    cosx大于等于-2
    cosx大于-2
    (4/20)+(4/30)+(9/20)+(9/30)*[(10-x)/10]≥1
    x＾x>2x
    x＾x>x
    x＾x>1

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