What is the sum of the product of (1/2) and (2/3) and (3/10)?
(1/2)与(2/3)的积与(3/10)的和是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(1/2) * (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/3) + (3/10)</gadget>
<output>19/30 = around 0.633333</output>

<result>19/30 = around 0.633333</result>