residential area needs to plant a square lawn with a side length of 45 meters. If it costs 9 yuan to plant turf per square meter, how much will it cost to plant this turf?
一个住宅小区要种植一块边长为45米的正方形草坪．如果种植每平方米草皮一共要花费9元，那么，种植这块草皮一共要花费多少元钱？
<gadget id="calculator">45 * 45 * 9</gadget>
<output>18_225</output>

<result>18_225</result>