1+x/2 - 2x-1≤1
    1.637*x^(1/2)+9.9*x<=1005
    1.637*x^(1/2)+9.9*x>=1000
    (1+2d)^(2)=(1+d)×(1+5d)
    (1+2d)^(2)=
    -x^(2)＋x<-2
    （x^(2)-4x+1）÷x>0
    1.2x<3 (x+1)÷2≤2
    1.2x<3 (x+1)≤2
    2x+4>3x
    x-3（x-1）≤7
    ((0.2*k+(0.2/3.1416)^2-0.1)*(0.2*k+0.9)-(0.2/3.1415)^2 *(0.2*k+1))/(0.2*k+(0.2/3.1416)^2-0.1)>0
    6x＋5>4x 18－7x<10－3x
    0.2*k+(0.2/3.14)^2-0.1>0
    ((0.2*k+(0.2/3.14)^2-0.1)*(0.2k+0.9)-(0.2k+1)*(0.2/3.14)^2)/(0.2*k+(0.2/3.14)^2-0.1)>0
    (x+2)/3-(2*(x+1))/2>=1
    (x+3)/2-(2*(x+1))/2>=1
    87.6×117.54%^x-51900×106.7%^x =0
    87.6×117.54^x-51900×106.7%^x =0
    87.6×117.54%^x-51900×106.7%^x ≥0

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