Xinxing Kindergarten bought a batch of mooncakes and distributed them to the children in the small class (2/7), the children in the middle class (3/7), and the children in the big class (1/7). How much is the total of the small class and the middle class?
新星幼儿园买回一批月饼，发给小班小朋友(2/7)，中班小朋友(3/7)，大班小朋友(1/7)．小班和中班一共发了几分之几？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(2/7) + (3/7)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>