A glass with a base area of 15 cm2 is filled with water 3 cm high. Now put a cylindrical iron block with a base radius of 1 cm and a height of 5 cm vertically into a glass of water, and ask how many centimeters the water level has risen (pi is 3)
一个底面积是15平方厘米的玻璃杯中装有高3厘米的水．现把一个底面半径是1厘米、高5厘米的圆柱形铁块垂直放入玻璃杯水中，问水面升高了多少厘米(圆周率取3)
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3 * 1</gadget>
<output>3</output>

<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">45 / 12</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(15/4) - 3</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>