(1283-i+3)/2(i+2)>=5
    -80+X-X*2%>50
    X2+3＞4X
    64x^2(1-x)^2-x^2-16x(1-x)^2>0
    16x(1-x)-2+x>0
    16x(1-x)(2-x)>(2-x)^2+16x(1-x)^2
    √40≥0.4√(50-x)+0.8√x
    (x-5)/2-1＜(3x+2)/2
    （1280-i+3)/2^(i+2)>=5
    （1028-i+3)/2^(i+2)>=5
    （1028-i+3)/2^(i+2)>5
    6(x-1)≥3+4x
    x/2+2≤x/3-1
    (x+3)/7＞x-5
    2^x-2＞（10000+x）/x
    3(x-1)＜2(4x-5)
    x-4≥2(x+2)
    -（x+1）/2＜3
    -（x-1）/2＜3
    6x^2-6x<0

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