Reduce a triangle according to l:3, that is, each side is reduced to the original ((())/(())).
把一个三角形按l：3缩小，也就是各边缩小到原来的((())/(()))．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>