40*0.75*0.9*(0.92^x)<11.25
    0.75*0.9*(0.92^x)<11.25
    -41800+30000+y-y×10%÷4-4500≥3000
    49x²-42x-72＞0
    3x²-2x-21≤0
    330-20（x-12）>270
    √（x^2-8）＜x+2
    √（x^2-8）＞x+2
    a^2-6×a>-6
    50-0.4t小于等于0
    50-0.4t<0
    -10x
    -1<(x^2+16)/10x<1
    -1
    -1<(x^2+1)/10x<1
    (2x+2)/(x-2)>=1
    3/1-4x＜3-4/x+2
    x^4-10x^2+9<0
    2^x>8
    x2+x-2>0

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