The product of two numbers is 640, one multiplier is enlarged by 1000 times, and the other multiplier remains unchanged, what is the product now.
两个数的积是640，一个乘数扩大1000倍，另一个乘数不变，现在的积是多少．
<gadget id="calculator">640 * 1_000</gadget>
<output>640_000</output>

<result>640_000</result>