0.95（17.26+93.51x）<23+65x
    -2048.7065+1146.8248n+n^2/3×(776.346+19.119n)×(2329.038+38.238n)/(1552.692+38.238n)-0.4×n^2×(254.939+4.766n)×（764.817+9.531n）/（509.878+9.531n）≥0
    (2x-0.9)(8x+46.02)/(5.4+x)>75.75
    (2x-1.02)(8x+45.23)/(5.3+x)>75.75
    (2x-0.78)(8x+46.9)/(5.5+x)>75.75
    (2x-0.54)(8x+48.67)/(5.7+x)>75.75
    30×(1-10%)(50-x)+40x≤1480
    -1/(4*a)-(9a)/4+0.4>8
    -1/4a-9a/4+1/2>8
    (3+x)/3>1-(2-x)/2, (-11)/12-(x-1)/3=(3+4x)/5-1, 6x+2(x-4)<=5(x-4)
    -11-4x+4<3x
    13.5z-710<14.25z-835
    6+2x>6-6+3x
    2x∧2-5x-13>0
    6x+2x-8<=5x-20
    6x+2(x-4)<=5(x-4)
    35-5x>=6+8x-10
    x+x^2+x^3+x^4+x^5+x^6>=99
    m+m+20≥72 40m+18(m+20)≤2000
    9+4a^2>4-8a

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