Xiaoli and Xiaodong make paper flowers, Xiaoli uses (1/2) sheets of paper, Xiaodong uses (2/5) sheets of paper, ask how many sheets of paper Xiaoli and Xiaodong share.
小丽和小冬做纸花，小丽用了(1/2)张纸，小冬用了(2/5)张纸，问小丽和小冬一共用了多少张纸．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) + (2/5)</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>