What is the land area of our country?

China's land area is 9.6 million square kilometers

It is known that a rectangular piece of land is three times as long as it is wide and covers an area of 1323 square meters. How many meters are the length and width

Let the width be x, then the length be 3x. The solution of 3x multiplied by x = 1323, x = 441 is X1 = 21, X2 = - 21, so the length = 21x3 = 63, the width is 21

How many trees can be planted on a hectare of land with a spacing of 5 meters and a row spacing of 4 meters

（100/4+1）*（100/5+1）=546

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