1
鍒濅腑鏁板浜烘暀鐗堝叓骞寸骇涓婂唽瀹炵敤璧勬枡
14.2.2
瀹屽叏骞虫柟鍏紡
涓�銆佸涔犵洰鏍?/p>
1
銆佷細鍒ゆ柇瀹屽叏骞虫柟寮忋�?/p>
2
銆佽兘鐩存帴鍒╃敤瀹屽叏骞虫柟鍥犲紡鍒嗚В銆?/p>
3
銆佹帉鎻″埄鐢ㄥ畬鍏ㄥ钩鏂瑰叕寮忓洜寮忓垎瑙ｇ殑姝ラ銆?/p>
浜屻�佽嚜涓婚涔?/p>
鍥犲紡鍒嗚В锛?/p>
2a
2
b
锛?/p>
4ab
2
=__________
锛岋紞
3a
3
b+12ab
3
=__________.
1
銆佸～绌猴細
(a+b)
2
=__________
锛?/p>
(a
锛?/p>
b)
2
=__________.
2
銆佹牴鎹笂闈㈢殑寮忓瓙濉┖锛?/p>
a
2
+2ab+b
2
=__________
锛?/p>
a
2
锛?/p>
2ab+b
2
=__________.
3
銆佸舰濡?/p>
a
2
+__________+b
2
涓?/p>
a
2
锛?/p>
__________+b
2
鐨勫紡瀛愮О涓哄畬鍏ㄥ钩鏂瑰紡
.
瀹屽叏骞虫柟寮忥細
a
2
卤
2ab+b
2
=(a
卤
b)
2
璇█鍙欒堪锛氫袱涓暟鐨?/p>
__________
鍔犱笂锛堝噺鍘伙級杩欎袱涓暟
__________
锛岀瓑浜庤繖涓や釜鏁?/p>
鐨勫拰锛堝樊锛夌殑骞虫柟銆?/p>
涓夈�佸悎浣滄帰绌?/p>
1
銆佸垽鏂笅鍒楀椤瑰紡鏄惁涓哄畬鍏ㄥ钩鏂瑰紡锛屽鏋滄槸杩愮敤瀹屽叏骞虫柟鍏紡灏嗗叾鍥犲紡鍒嗚В銆?/p>
鈶?/p>
b
2
+b+1
鈶?/p>
a
2
锛?/p>
ab+b
2
鈶?/p>
1+4a
2
鈶?/p>
a
2
锛?/p>
a+
1
4
2
銆佸垎瑙ｅ洜寮忥細鈶?/p>
x
2
+12x+36
鈶♀�?/p>
2xy
鈥?/p>
x
2
鈥?/p>
y
2
鈶?/p>
ax
2
+2a
2
x+a
3
3
銆佸凡鐭?/p>
1
4
x
x
飥?/p>
飥?/p>
锛屾眰锛氣懘
2
2
1
x
x
飥?/p>
鐨勫�硷紱鈶?/p>
2
1
x
x
飪?/p>
飪?/p>
飥?/p>
飪?/p>
飪?/p>
飪?
飪?/p>
鐨勫�?/p>
.
4
銆佸凡鐭?/p>
2
1
4
0
4
b
a
a
飥?/p>
飥?/p>
飥?/p>
飥?/p>
飥?/p>
锛屾眰
a
b
鐨勫�?/p>
.
鍥涖�佸綋鍫傝瘎浠?/p>
1
銆佸垎瑙ｅ洜寮忥細
鈶?/p>
a
2
+ab+
1
4
b
2
鈶碉紞
2x
3
y+4x
2
y
锛?/p>
2xy
鈶?/p>
(a
锛?/p>
b)
2
锛?/p>
6(b
锛?/p>
a)+9
鈶?/p>
(x
2
锛?/p>
2x)
2
+2(x
2
锛?/p>
2x)+1
2
銆佸洜寮忓垎瑙ｏ細
鈶?/p>
(a
2
锛?/p>
4a)
2
+8(a
2
锛?/p>
4a)+16
鈶?/p>
2x
2
锛?/p>
12x+18