(4/5) tons of watermelons are shipped from the vegetable market, and the amount of melons shipped is (1/2) tons less than (3/4) of watermelons. How many tons of melons are shipped?
菜市场运来(4/5)吨西瓜，运来的甜瓜比西瓜的(3/4)还要少(1/2)吨，运来甜瓜多少吨？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) * (3/4)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>