鍒濅腑鏁板璇曞嵎
鐏胯嫢瀵掓槦鏁寸悊鍒朵綔
14.3.2
鍏紡娉?/p>
绗?/p>
1
璇炬椂
杩愮敤骞虫柟宸叕寮忓洜寮忓垎瑙?/p>
瑕佺偣鎰熺煡
a
2
-b
2
=_____
锛屽嵆涓や釜鏁扮殑骞虫柟宸紝绛変簬杩欎袱涓暟鐨勫拰涓庤繖涓や釜鏁扮殑宸殑
_____.
棰勪範缁冧範
(
鏉ュ涓�?/p>
)
鍥犲紡鍒嗚В锛?/p>
25
锛?/p>
a
2
锛?/p>
_____
锛?/p>
鐭ヨ瘑鐐?/p>
1
鐩存帴杩愮敤骞虫柟宸叕寮忓洜寮忓垎瑙?/p>
1.
鍒嗚В鍥犲紡锛?/p>
(1)4x
2
-y
2
锛?/p>
(2)-16+a
2
b
2
锛?/p>
(3)
100
2
x
-25y
2
;
(4)(x+2y)
2
-(x-y)
2
锛?/p>
(5)16-b
4
.
鐭ヨ瘑鐐?/p>
2
鍏堟彁鍏洜寮忓悗杩愮敤骞虫柟宸叕寮忓洜寮忓垎瑙?/p>
2.
鍒嗚В鍥犲紡锛?/p>
(1)a
3
-9a
锛?/p>
(2)3m(2x-y)
2
-3mn
2
;
(3)(a-b)b
2
-4(a-b).
3.
(
澶х悊涓�?/p>
)
鍒嗚В鍥犲紡锛?/p>
x
3
锛?/p>
4x
锛?/p>
____
锛?/p>
4.
(
鐩婇槼涓�?/p>
)
鑻?/p>
x
2
-9=(x-3)(x+a)
锛屽垯
a=_____.
5
.(
瀛濇劅涓�?/p>
)
鑻?/p>
a-b=1
锛屽垯浠ｆ暟寮?/p>
a
2
-b
2
-2b
鐨勫�间负
_____.
6.
鍦ㄥ疄鏁拌寖鍥村唴鍥犲紡鍒嗚В锛?/p>
(1)x
2
-3
锛?/p>
(2)x
4
-4.
鎸戞垬鑷垜
7.
鑰佸笀鍦ㄩ粦鏉夸笂鍐欏嚭涓変釜绠楀紡锛?/p>
5
2
-3
2
=8
脳
2
锛?/p>
9
2
-7
2
=8
脳
4
锛?/p>
15
2
-3
2
=8
脳
27
锛岀帇鍗庢帴鐫�鍙堝啓浜嗕袱涓叿鏈夊悓鏍疯寰嬬殑绠楀紡锛?/p>
11
2
-5
2
=8
脳
12
锛?/p>
15
2
-7
2
=8
脳
22
锛屸�?/p>
(1)
璇蜂綘鍐嶅啓鍑轰袱涓?/p>
(
涓嶅悓浜庝笂闈㈢畻寮?/p>
)
鍏锋湁涓婅堪瑙勫緥鐨勭畻寮忥紱
(2)
鐢ㄦ枃瀛楀啓鍑哄弽鏄犱笂杩扮畻寮忕殑瑙勫緥锛?/p>