ÌâÄ¿ÄÚÈÝ
12£®ÁÐʽ¼ÆË㣮£¨1£©20Óë3.1µÄ²îµÄ6±¶£¬ÔÙ³ýÒÔ0.7£¬ÉÌÊǶàÉÙ£¿
£¨2£©Ò»¸öÊýµÄ3±¶¼õÈ¥12.12µÄÒ»°ëµÈÓÚ10.44£¬ÇóÕâ¸öÊý£®£¨Ó÷½³Ì½â£©
£¨3£©$\frac{2}{3}$¼ÓÉÏ$\frac{3}{4}$³ý$\frac{1}{4}$µÄÉÌ£¬ËùµÃµÄºÍ³Ë$\frac{1}{4}$£¬»ýÊǶàÉÙ
£¨4£©¼×ÊýµÄ$\frac{2}{3}$ÊÇ18£¬ÒÒÊýµÄ$\frac{3}{4}$ÊÇ18£¬¼×¡¢ÒÒÁ½ÊýµÄºÍÊǶàÉÙ£¿
·ÖÎö £¨1£©ÇóÉÌ£¬¾ÍÒªÖªµÀ±»³ýÊýºÍ³ýÊý·Ö±ðÊǶàÉÙ£®¸ù¾ÝÌâÒ⣬±»³ýÊýÊÇ£¨20-3.1£©¡Á6£¬³ýÊýÊÇ0.7£¬ÓÉ´ËÁÐʽ¼ÆË㣻
£¨2£©ÉèÕâ¸öÊýΪx£¬¸ù¾ÝÌâÒâÁз½³Ì3x-12.12¡Á$\frac{1}{2}$=10.44½â´ð¼´¿É£»
£¨3£©ÏÈËã$\frac{3}{4}$³ý$\frac{1}{4}$µÄÉÌ£¬ÔÙÓÃ$\frac{2}{3}$¼ÓÉÏËùµÃµÄÉÌ£¬ËùµÃµÄºÍ³Ë$\frac{1}{4}$¼´¿ÉÇó½â£»
£¨4£©Ê×ÏÈÀûÓÃÒÑÖªÒ»¸öÊýµÄ¼¸·ÖÖ®¼¸ÊǶàÉÙ£¬ÇóÕâ¸öÊýÓóý·¨·Ö±ð¸ù¾Ý¼×ÊýµÄ$\frac{2}{3}$ÊÇ18ÇóµÃ¼×Êý£¬ÒÒÊýµÄ$\frac{3}{4}$ÊÇ18ÇóµÃÒÒÊý£¬½øÒ»²½Ïà¼ÓÇóµÃ´ð°¸¼´¿É£®
½â´ð ½â£º£¨1£©£¨20-3.1£©¡Á6¡Â0.7
=16.9¡Á6¡Â0.7
=101.4¡Â0.7
=144$\frac{6}{7}$
´ð£ºÉÌÊÇ144$\frac{6}{7}$£®
£¨2£©3x-12.12¡Á$\frac{1}{2}$=10.44
3x-6.06=10.44
3x-6.06+6.06=10.44+6.06
3x=16.5
3x¡Â3=16.5¡Â3
x=5.5
´ð£ºÕâ¸öÊýÊÇ5.5£®
£¨3£©£¨$\frac{2}{3}$+$\frac{1}{4}$¡Â$\frac{3}{4}$£©¡Á$\frac{1}{4}$
=£¨$\frac{2}{3}$+$\frac{1}{3}$£©¡Á$\frac{1}{4}$
=1¡Á$\frac{1}{4}$
=$\frac{1}{4}$
´ð£º»ýÊÇ$\frac{1}{4}$£®
£¨4£©18¡Â$\frac{2}{3}$+18¡Â$\frac{3}{4}$
=27+24
=51
´ð£ºÕâ¸öÊýÊÇ51£®
µãÆÀ ÕâÀàÐ͵ÄÌâĿҪ·ÖÇå³þÊýÁ¿Ö®¼äµÄ¹ØÏµ£¬ÏÈÇóʲôÔÙÇóʲô£¬ÕÒÇåÁÐʽµÄ˳Ðò£¬ÁгöËãʽºÍ·½³Ì¼ÆË㣮
| A£® | 5dm | B£® | 15dm | C£® | 45dm |