·ÖÎö £¨1£©¢Ù¸ù¾Ý¶àÏîʽ³Ë¶àÏîʽµÄ·½·¨£¬Çó³öËãʽ£¨a-2£©£¨a2+2a+4£©µÄÖµÊǶàÉÙ¼´¿É£®
¢Ú¸ù¾Ý¶àÏîʽ³Ë¶àÏîʽµÄ·½·¨£¬Çó³öËãʽ£¨x-2y£©£¨x2+2xy+4y2£©µÄÖµÊǶàÉÙ¼´¿É£®
£¨2£©¸ù¾ÝÉÏÃæµÄÕûʽ¢Ù¡¢¢ÚµÄ¼ÆËã½á¹û£¬ÎÒÄÜ·¢ÏÖÒ»¸öеij˷¨¹«Ê½£º£¨a-b£©£¨a2+ab+b2£©=a3-b3£¨ÇëÓú¬a£¬bµÄʽ×Ó±íʾ£©£®
£¨3£©¸ù¾Ýa2ÊǵÚÒ»¸öÒòÊýµÄƽ·½£¬b2Êǵڶþ¸öÒòÊýµÄƽ·½£¬abÊÇÁ½¸öÒòÊýµÄ»ý£¬ÅжϳöÄÜÓ÷¢Ïֵij˷¨¹«Ê½¼ÆËãµÄÊÇÄĸöËãʽ¼´¿É£®
£¨4£©¸ù¾Ý£¨a-b£©£¨a2+ab+b2£©=a3-b3£¬Çó³öËãʽ£¨2x-3£©£¨4x2+6x+9£©µÄÖµÊǶàÉÙ¼´¿É£®
½â´ð ½â£º£¨1£©¢Ù£¨a-2£©£¨a2+2a+4£©
=a3+2a2+4a-2a2-4a-8
=a3-8
¢Ú£¨x-2y£©£¨x2+2xy+4y2£©
=x3+2x2y+4xy2-2x2y-4xy2-8y3
=x3-8y3
£¨2£©ÉÏÃæµÄÕûʽ³Ë·¨¼ÆËã½á¹ûºÜ¼ò½à£¬ÎÒÄÜ·¢ÏÖÒ»¸öеij˷¨¹«Ê½£º
£¨a-b£©£¨a2+ab+b2£©=a3-b3£¨ÇëÓú¬a£¬bµÄʽ×Ó±íʾ£©£®
£¨3£©ÏÂÁи÷ʽÄÜÓÃÄã·¢Ïֵij˷¨¹«Ê½¼ÆËãµÄÊÇ£¨C£©£®
A£®£¨a-5£©£¨a2-5a+25£©B£®£¨2m-n£©£¨2m2+2mn+n2£©C£®£¨3-x£©£¨9+3x+x2£©D£®£¨m-n£©£¨m2+2mn+n2£©
£¨4£©£¨2x-3£©£¨4x2+6x+9£©
=£¨2x£©3-33
=8x3-27
¹Ê´ð°¸Îª£º£¨a-b£©£¨a2+ab+b2£©=a3-b3£»C£»8x3-27£®
µãÆÀ ´ËÌâÖ÷Òª¿¼²éÁËÕûʽµÄ»ìºÏÔËË㣬ҪÊìÁ·ÕÆÎÕ£¬½â´ð´ËÌâµÄ¹Ø¼üÊÇÒªÃ÷È·£ºÓг˷½¡¢³Ë³ýµÄ»ìºÏÔËËãÖУ¬Òª°´ÕÕÏȳ˷½ºó³Ë³ýµÄ˳ÐòÔËË㣬ÆäÔËËã˳ÐòºÍÓÐÀíÊýµÄ»ìºÏÔËËã˳ÐòÏàËÆ£®
Ä꼶 | ¸ßÖÐ¿Î³Ì | Ä꼶 | ³õÖÐ¿Î³Ì |
¸ßÒ» | ¸ßÒ»Ãâ·Ñ¿Î³ÌÍƼö£¡ | ³õÒ» | ³õÒ»Ãâ·Ñ¿Î³ÌÍƼö£¡ |
¸ß¶þ | ¸ß¶þÃâ·Ñ¿Î³ÌÍƼö£¡ | ³õ¶þ | ³õ¶þÃâ·Ñ¿Î³ÌÍƼö£¡ |
¸ßÈý | ¸ßÈýÃâ·Ñ¿Î³ÌÍƼö£¡ | ³õÈý | ³õÈýÃâ·Ñ¿Î³ÌÍƼö£¡ |
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
A£® | x£¾$\frac{1}{2}$ | B£® | x¡Ý$\frac{1}{2}$ | C£® | x£¼$\frac{1}{2}$ | D£® | x£¾0 |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ
A£® | ¶Ô¿Õ¼äʵÑéÊÒ¡°Ìì¿Õ¶þºÅ¡±Á㲿¼þµÄ¼ì²é£¬²ÉÓóéÑùµ÷²éµÄ·½Ê½ | |
B£® | Á˽âÅÚµ¯µÄɱÉËÁ¦£¬²ÉÓÃÈ«Ãæµ÷²éµÄ·½Ê½ | |
C£® | ¶ÔÖÐÑę̈¡°ÐÂÎÅÁª²¥¡±ÊÕÊÓÂʵĵ÷²é£¬²ÉÓÃÈ«Ãæµ÷²éµÄ·½Ê½ | |
D£® | ¶Ôʯ¼ÒׯÊÐʳƷºÏ¸ñÇé¿öµÄµ÷²é£¬²ÉÓóéÑùµ÷²éµÄ·½Ê½ |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ
²é¿´´ð°¸ºÍ½âÎö>>
°Ù¶ÈÖÂÐÅ - Á·Ï°²áÁбí - ÊÔÌâÁбí
ºþ±±Ê¡»¥ÁªÍøÎ¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨Æ½Ì¨ | ÍøÉÏÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | µçÐÅթƾٱ¨×¨Çø | ÉæÀúÊ·ÐéÎÞÖ÷ÒåÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | ÉæÆóÇÖȨ¾Ù±¨×¨Çø
Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com