(4/5)+(1/5)*(4/7)=how much.
(4/5)+(1/5)*(4/7)=多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(1/5) * (4/7)</gadget>
<output>4/35 = around 0.114286</output>

<gadget id="calculator">(4/5) + (4/35)</gadget>
<output>32/35 = around 0.914286</output>

<result>32/35 = around 0.914286</result>