2x>7
    x∧2-3x-4≤0
    2∧x≤4
    x∧2-5x+4≤0
    5-2(x+2)<=3
    x∧2-4x-5＜0
    x^2-2x<0
    x^2>2x
    x2>2x
    (1+x/1-x)＞0
    (0.5x-1)（0.5x-1）-4x(1-0.5x)＞0
    2/11<(1.5x-2.2)/25<7/22
    40（x-90）-40x*0.1>=900
    40（x-90）-40*0.1>=900
    -3x^2+5x-4≥0
    (3x+2)(x+2)>4
    (x+1)(x+2)<(x+1)(2-x)+1
    [2(m-1)]^2-4*1*(2m+6)≥0
    x2大于x
    -3x∧2+2x≥0

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