(1+A+0.65)*1.21^2*1.12^2>(1+A)*1.21^3*1.12^3
    (1+A+0.65)*1.21^2*1.12^2*1.048>(1+A)*1.21^3*1.12^3
    (1+A+0.65)*1.21^2*1.12^2*1.057>(1+A)*1.21^3*1.12^3
    (1+A+0.65)*1.272^2>(1+A)*1.272^3
    569.168×(0.4+0.6×((t-7))/2)=15×(1-cos(π×((t-6))/5),7
    0.19x+7.5x<=12.8
    0.8^n<=0.1
    100*n^2<2^n
    8*n*n<64*n*log(2,n)
    (8*log(2,n))/n>1
    log(2,n)>5
    n/2>5
    n>1
    1-0.8^x-0.2*x*0.2*(0.8)^(x-1)>0.9
    3x^2
    3+4<6x<9^2
    1800-300≤35a+26（50-a）≤1800-270
    1800-270≤35a+26（50-a）≤1800-300
    -x^2-x＞＝-12
    （x-20）（400-10x）小于等于8

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