Three unequal numbers can be expressed in the form of 1, a+b, a, or in the form of 0, b/a, b. Then a+3b=how much.
三个互不相等的数可以表示为1，a+b，a的形式，也可表示为0，b/a，b的形式．那么a+3b=多少．
<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">(-1) + 3</gadget>
<output>2</output>

<result>2</result>