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What are the application problems of the area of the second volume of mathematics in the third grade?
There is a classroom 9 meters long' 6 meters wide' 3 meters high. Now we need to paint the left and right walls of the classroom. Each wall has two windows with an area of 2 square meters, and the right wall has two doors with an area of 3 square meters.

. Do you know the area to be painted?