ÌîÑ¡ÌâרÏîѵÁ·£¨Ê®¶þ£©
Ñ¡ÔñÌ⣨ÿСÌâ5·Ö,¹²60·Ö£©
1£®Èô¼¯ºÏA= £¬Ôò = £¨ £©
A£® B£® C£® D£®
2£®ÇúÏß ÔÚµã£Á£¨£°£¬£±£©´¦µÄÇÐÏßбÂÊΪ £¨ £©
£Á£®£±¡¡¡¡ £Â£®£²¡¡¡¡¡¡¡¡ £Ã£® ¡¡¡¡¡¡ £Ä£®