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=== On Problem 1 ===
* ''Problem:''
** 3 bundles of high-quality rice straws, 2 bundles of mid-quality rice straws and 1 bundle of low-quality rice straw produce 39 units of rice
** 2 bundles of high-quality rice straws, 3 bundles of mid-quality rice straws and 1 bundle of low-quality rice straw produce 34 units of rice
** 1 bundles of high-quality rice straw, 2 bundles of mid-quality rice straws and 3 bundle of low-quality rice straws produce 26 units of rice
** Question: how many units of rice can high, mid and low quality rice straw produce respectively?
* ''Solution:''
** High-quality rice straw each produces {{sfrac|9
** Mid-quality rice straw each produces {{sfrac|4
** Low-quality rice straw each produces {{sfrac|2
The presentation of Problem 1 contains a description (not a crisp indication) of the procedure for obtaining the solution. The procedure has been referred to as ''fangcheng shu'', which means "''fangcheng'' procedure." The remaining problems all give the instruction "follow the ''fangcheng''" procedure sometimes followed by the instruction to use the "procedure for positive and negative numbers".
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