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How to do the questions in the second volume of mathematics in the fourth grade of primary school?
Turn it into a straight line. Although there is a dotted line in the upper right corner of the graph, all vertical lines can be translated to the far right to get a total of 5 grids, and the above curve can get a total of 10 in the same way. When a polygon is converted into a rectangle, the perimeter is 2*(5+ 10)=30.

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