The Yangtze River in my country is the third longest river in the world. Its total length is only 1/46 shorter than that of the Amazon River in South America, which is the largest river in the world. The total length of the Amazon River is 6,440 kilometers.
我国的长江是世界第三大河，全长仅比世界第一大河-南美洲的亚马逊河少(1/46)，亚马逊河全长6440千米，长江全长约多少千米？
<gadget id="calculator">1 / 46</gadget>
<output>1/46 = around 0.021739</output>

<gadget id="calculator">1 - (1/46)</gadget>
<output>45/46 = around 0.978261</output>

<gadget id="calculator">6_440 * (45/46)</gadget>
<output>6_300</output>

<result>6_300</result>