(8/9)-(7/8)+(6/7)-(5/6)+(4/5)-(3/4)+(2/3)-(1/2)=how much.
(8/9)-(7/8)+(6/7)-(5/6)+(4/5)-(3/4)+(2/3)-(1/2)=多少．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(8/9) - (7/8)</gadget>
<output>1/72 = around 0.013889</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(6/7) - (5/6)</gadget>
<output>1/42 = around 0.02381</output>

<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>1/20 = around 0.05</output>

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

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

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/72) + (1/42) + (1/20) + (1/6)</gadget>
<output>641/2_520 = around 0.254365</output>

<result>641/2_520 = around 0.254365</result>