2^7-2x>0.5^-x2-4
    n∧2-n＞2∧50
    4k（4k-5）<0
    -2<1/-2m<1
    3x≥4-2x
    6X^2+12X＞0
    0.22×1×0.7×x÷2.9≥50
    0.22×7×0.7×x÷100≥100
    0.22×1×0.65×x÷100≥50
    0.22×1×0.65×x÷100≥75
    0.22×1×0.7×x÷100≥75
    0.22×1×0.7×x÷100≥75
    0.22×1×0.7×x÷100≥75
    0.22×7×0.7×x÷2.9≥100
    0.22×1×0.65×x÷5.1≥75
    0.22×3×0.7×x÷21.1≥100
    0.22×3×0.7×x÷21.7≥100
    0.22×3×0.7×x÷21.7≥100
    -1/3x-1>2+7/6x
    50+0.4x<0.6x

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