4.5 yuan for 3 exercise books, 6 yuan for 5 native language texts. How much is each exercise book more expensive than each language text?
3本练习本4.5元，5本语文本6元．每本练习本比每本语文本贵多少元？
<gadget id="calculator">4.5 / 3</gadget>
<output>1.5</output>

<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1.5 - (6/5)</gadget>
<output>0.3</output>

<result>0.3</result>