3*（n-2）-1/2*（n-2）*3-1/2*1*（n-3）-1/2*3*1小于等于3
    x^2-47x+388≥48
    －30x∧2＋3300x-8400≥6480
    －30xx+3300x-8400≥6480
    －30x2+3300x-8400≥6480
    （21+d）×（21+4d）<（21+11d）
    1102.13-227.1×(1.32+0.7/2+x )(0.52+2x )≤0.7×1×1570×[2×(1.32+0.7/2+x/2 )+(0.52+x )]×x
    1102.13-227.1×(1.32+0.7/2+x )(0.52+2x )≤0.7×1×1570×[2×(1.32+0.7/2+x )+(0.52+2x )]×x
    1.1×2955.03×10^6≤18.4×2000x(1450—x×0.5)
    1.1×2955.03×106≤18.4×2000x(1450—x×0.5)
    2(x-2)≤2-x (x+2)/2>(x+3)/3
    2(x-2)≤2-x
    6x<=x+25
    x+3<=2x
    5x-3>2x-6
    4x+11<=7
    4x+11<=-7
    9x-4>7x+4
    4x-13<-1
    5x>2x+6

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