下列逻辑函数中,与<imgwidth="47"height="19"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj02.files/szlj026247.png">相等的是______。
①
<imgwidth="77"height="27"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj02.files/szlj026262.png">
②
<imgwidth="87"height="24"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj02.files/szlj026265.png">
③
<imgwidth="68"height="27"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj02.files/szlj026268.png">
④
<imgwidth="79"height="29"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj02.files/szlj026271.png">