The ocean area on the earth's surface is about 361 million square kilometers, which is 212 million square kilometers larger than the land area. What is the surface area of the entire earth in about 100 million square kilometers?
地球表面的海洋面积约有3.61亿平方千米，比陆地面积多2.12亿平方千米．整个地球表面积约是多少亿平方千米？
<gadget id="calculator">3.61 - 2.12</gadget>
<output>1.49</output>

<gadget id="calculator">1.49 + 3.61</gadget>
<output>5.1</output>

<result>5.1</result>