x(1-x^18)/(1-x)=223.0753843
    （10-2x）×（8-2x）=64
    3x=2x+12
    x(1-x^18)/(1-x)=217.8910364
    10-2x×8-2x=64
    x(1-x^18)/(1-x)=414.2603305
    x(1-x^18)/(1-x)=203.611142
    x(1-x^18)/(1-x)=296.8695527
    x(1-x^18)/(1-x)=118.6283545
    x(1-x^18)/(1-x)=143.8288791
    x(1-x^18)/(1-x)=161.9234616
    x(1-x^18)/(1-x)=173.4952751
    x(1-x^18)/(1-x)=108.3322163
    x(1-x^18)/(1-x)=344.1821228
    x(1-x^18)/(1-x)=244.1057356
    x(1-x^18)/(1-x)=252.2511264
    x(1-x^18)/(1-x)=138.0417643
    x(1-x^18)/(1-x)=146.4776888
    x(1-x^18)/(1-x)=415.778287
    x(1-x^18)/(1-x)=376.9365695

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