3x-1>2(2-5x)
    (x-5)/3+1<=(3/2)*x
    2-5x<8-6x
    x/（27.1+x）<=0.299
    （5.4－3.6）x＋（14－8）×[（1520－3.6x）／8]≧1050
    1/2 * ( 20 * x + 10 * x ) > ( 100 - 2.5 * x ) + x * 10*0.5
    -3a+2<-2a+2
    59+x=97
    59+x=972
    94+xx=257
    87+x=62
    87+x=62
    87+x=62
    180000=32500+0.15*X
    13x^2-24x+11=0
    0.25*0.74*0.74+0.13+0.2+0.2+0.1
    4x（3-x）=3√（16xx-9）
    0.25*0.74*0.74+0.25+0.2+0.2+0.1
    3x=2x+2x
    3x=2x+5

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