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How to do the problem of page 26 12 in the second volume of the fifth grade math book?
Method 1: Calculate the area of each painted part separately and add them. Method 2: Expand "Top", "Left" and "Right" into a big rectangle. The length of the expanded rectangle is "40*3+65*2" and the width is 40. Method 3: The shape from the left is the same as that from the right, and the shape from above is the same as that from below.