Simple calculation: (3/4)*(((7/15)-(1/5))+(2/3)).
简便运算：(3/4)*(((7/15)-(1/5))+(2/3))．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(7/15) - (1/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/15) + (2/3)</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">(3/4) * (14/15)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>