-50-(100+x)*0.01+x ≥ 10
    250(140-m)+450m≧42200
    250(140-m)+150m≧42200
    (0.2+2t+0.8*8.6)*(7.9t+89.16)/(10.7+t)/86>=1.6
    -50-(100+x)×0.1+x >= 10
    -50-(100+x)×1%+x>=10
    55x+150(30-x)＜2600
    55x+150(30-x)＜
    3x^2-10x-1>0
    10x＞6×2
    2（x×2）-3x+1<0
    2x×2-3x+1<0
    x×2-11x+18>0
    -x×2-7x+8>0
    （-x×2）-7x+8>0
    -（x×2）-7x+8>0
    3x-x<0
    x+3/2 - 5x-1/6 x≦5
    x/2 -3x＞10
    x/188+10>x/180

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