What is the product of the sum of (3/4) and (2/5) multiplied by (4/9)?
(3/4)与(2/5)的和乘(4/9)，积是多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) + (2/5)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(23/20) * (4/9)</gadget>
<output>23/45 = around 0.511111</output>

<result>23/45 = around 0.511111</result>