The perimeter of an isosceles triangle is (7/8) decimeters, the length of one of the sides is (1/4) decimeters, how many decimeters is the length of the base?
一个等腰三角形的周长是(7/8)分米，其中一条腰的长度是(1/4)分米，底边的长是多少分米？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/8) - (1/2)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>