下列各式中有()等于<imgwidth="120"height="28"v:shapes="_x0000_i1263"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image281.png">
①
<imgwidth="146"height="58"v:shapes="_x0000_i1264"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image283.png">
②
<imgwidth="146"height="58"v:shapes="_x0000_i1265"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image285.png">
③
<imgwidth="166"height="58"v:shapes="_x0000_i1266"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image287.png">
④
<imgwidth="156"height="58"v:shapes="_x0000_i1267"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image289.png">