If (2/7)*a=(3/4)*b=1, then a*b=how much.
如果(2/7)*a=(3/4)*b=1，那么a*b=多少．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(7/2) * (4/3)</gadget>
<output>14/3 = around 4.666667</output>

<result>14/3 = around 4.666667</result>