Calculation: 100-99+98-97+96-95+94-93+93-92+91=how much.
计算：100-99+98-97+96-95+94-93+93-92+91=多少．
<gadget id="calculator">100 - 99</gadget>
<output>1</output>

<gadget id="calculator">98 - 97</gadget>
<output>1</output>

<gadget id="calculator">96 - 95</gadget>
<output>1</output>

<gadget id="calculator">94 - 93</gadget>
<output>1</output>

<gadget id="calculator">93 - 92</gadget>
<output>1</output>

<gadget id="calculator">1 + 1 + 1 + 1 + 1 + 91</gadget>
<output>96</output>

<result>96</result>