Observe 5*2=5+55=60, 7*4=7+77+777+7777=8638, infer the value of 9*5.
观察5*2=5+55=60，7*4=7+77+777+7777=8638，推知9*5的值是多少．
<gadget id="calculator">9 + 99 + 999 + 9_999 + 99_999</gadget>
<output>111_105</output>

<result>111_105</result>