浜屾鍑芥暟缁忓吀绮捐
棰樹竴锛氬凡鐭ユ姏鐗╃嚎鍘讹細
y = ox
2
+Z?x+c
锛?/p>
鍏朵腑
a,
b,
c
閮戒笉绛変簬
0
锛?/p>
,
瀹冪殑椤剁偣鍧愭爣
h
4/7f 鈻?nbsp;鈥?/p>
P
锛?/p>
-
鈥?/p>
锛?/p>
锛夛紝涓?/p>
y
杞寸殑浜ょ偣鏄?/p>
M
锛?/p>
0, c
锛?/p>
.
鎴戜滑绉颁互
M
涓洪《鐐癸紝瀵圭О杞存槸
y
杞存湀鈥㈣繃鐐?/p>
P
鐨勬姏
鐗?/p>
2a 4ci
绾夸负鎶涚墿绾垮幎鐨勪即闅忔姏鐗╃嚎锛岀洿绾?/p>
PM
涓哄幎鐨勪即闅忕洿绾?/p>
.
宸茬煡鏈変竴鎶涚墿绾匡級锛?/p>
=
涓�
2?+4x+.l,
姹傚畠鐨勪即
闅忕洿绾垮拰浼撮殢鎶涚墿绾跨殑瑙ｆ瀽寮?/p>
.
棰樹簩锛氬鍥撅紝鎶涚墿绾?/p>
y =
鍏�
0
鍔?/p>
+8
涓?/p>
y
杞寸浉浜や簬鐐?/p>
A,
涓庤繃鐐?/p>
A
骞宠浜?/p>
x
杞寸殑鐩寸嚎鐩镐氦浜庣偣
B
锛堢偣
B
鍦ㄧ
浜岃薄闄愶級锛屾姏鐗╃嚎鐨勯《鐐?/p>
C
鍦ㄧ洿绾?/p>
OB
涓婏紝涓旂偣
C
涓虹殑涓偣锛屽绉拌酱涓?/p>
x
杞寸浉浜や簬鐐?/p>
D,
骞?/p>
绉绘姏鐗╃嚎锛?/p>
浣垮叾缁忚繃鐐逛汉銆?/p>
D,
鍒欏钩绉诲悗鐨勬姏鐗╃嚎鐨勮В鏋愬紡涓?/p>
銉?/p>
棰樹笁锛氬鍥撅紝浜屾鍑芥暟
y =
ca
2
+bx+c
锛?/p>
a +
0
锛?/p>
鐨勫浘褰栦笌
x
杞存鍗婅酱鐩镐氦浜?/p>
A
銆?/p>
B
涓ょ偣
,
涓庯級锛岃酱鐩镐氦浜?/p>
鐐?/p>
C,
瀵圭О杞翠负鐩寸嚎
x = 2,
涓?/p>
O
A = OC,
鍒欎笅鍒楃粨璁猴細
庐abc> 0
锛?/p>
鈶?/p>
9a+3Z?+c<0
锛?/p>
鈶?/p>
c> -1
锛?/p>
鈶?/p>
鍏充簬鍏�鐨勬柟绋?/p>
a^+bx+c = 0
锛?/p>
a
涓?/p>
0
锛?/p>
鏈変竴涓牴涓轰竴涓?/p>
.
a
鍏跺碑姝ｇ‘鐨勭粨璁轰釜鏁版湁锛堬級
