1
锛庡鍥撅紝鍦ㄥ钩闈㈢洿瑙掑潗鏍囩郴涓紝鎶涚墿绾?/p>
y=ax
2
+
bx
+
c
锛?/p>
a
鈮?/p>
0
锛夌殑椤剁偣涓?/p>
B
锛?/p>
2
锛?/p>
1
锛?/p>
锛?/p>
涓旇繃鐐?/p>
A
锛?/p>
0
锛?/p>
2
锛?/p>
锛岀洿绾?/p>
y=x
涓庢姏鐗╃嚎浜や簬鐐?/p>
D
锛?/p>
E
锛堢偣
E
鍦ㄥ绉拌酱鐨勫彸渚э級
锛屾姏鐗╃嚎
鐨勫绉拌酱浜ょ洿绾?/p>
y=x
浜庣偣
C
锛屼氦
x
杞翠簬鐐?/p>
G
锛?/p>
EF
鈯?/p>
x
杞达紝鍨傝冻涓?/p>
F
锛岀偣
P
鍦ㄦ姏鐗╃嚎涓婏紝
涓斾綅浜庡绉拌酱鐨勫彸渚э紝
PQ
鈯?/p>
x
杞达紝鍨傝冻涓虹偣
Q
锛屸柍
PCQ
涓虹瓑杈逛笁瑙掑舰
锛?/p>
1
锛夋眰璇ユ姏鐗╃嚎鐨勮В鏋愬紡锛?/p>
锛?/p>
2
锛夋眰鐐?/p>
P
鐨勫潗鏍囷紱
锛?/p>
3
锛夋眰璇侊細
CE=EF
锛?/p>
锛?/p>
4
锛夎繛鎺?/p>
PE
锛屽湪
x
杞翠笂鐐?/p>
Q
鐨勫彸渚ф槸鍚﹀瓨鍦ㄤ竴鐐?/p>
M
锛屼娇鈻?/p>
CQM
涓庘柍
CPE
鍏ㄧ瓑锛熻嫢
瀛樺湪锛岃瘯姹傚嚭鐐?/p>
M
鐨勫潗鏍囷紱鑻ヤ笉瀛樺湪锛岃璇存槑鐞嗙敱锛?/p>
[
娉細
3
+
2
=
锛?
+
1
锛?/p>
2
]
锛?/p>
銆愬垎鏋愩�?/p>
锛?/p>
1
锛夋牴鎹姏鐗╃嚎鐨勯《鐐规槸锛?/p>
2
锛?/p>
1
锛?/p>
锛屽洜鑰岃鎶涚墿绾跨殑琛ㄨ揪寮忎负
y=a
锛?/p>
x
锕?/p>
2
锛?
2
+
1
锛屾妸
A
鐨勫潗鏍囦唬鍏ュ嵆鍙眰寰楀嚱鏁扮殑瑙ｆ瀽寮忥紱
锛?/p>
2
锛夋牴鎹柍
PCQ
涓虹瓑杈逛笁瑙掑舰锛屽垯鈻?/p>
CGQ
涓紝鈭?/p>
CQD=30掳
锛?/p>
CG
鐨勯暱搴﹀彲浠ユ眰寰楋紝
鍒╃敤鐩磋涓夎褰㈢殑鎬ц川锛?/p>
鍗冲彲姹傚緱
CQ
锛?/p>
鍗崇瓑杈光柍
CQP
鐨勮竟闀匡紝
鍒?/p>
P
鐨勭旱鍧愭爣浠ｅ叆浜?/p>
娆″嚱鏁扮殑瑙ｆ瀽寮忥紝鍗冲彲姹傚緱
P
鐨勫潗鏍囷紱
锛?/p>
3
锛夎В鏂圭▼缁勫嵆鍙眰寰?/p>
E
鐨勫潗鏍囷紝鍒?/p>
EF
鐨勯暱绛変簬
E
鐨勭旱鍧愭爣锛?/p>
OE
鐨勯暱搴︼紝鍒╃敤鍕?/p>
鑲″畾鐞嗗彲浠ユ眰寰楋紝鍚岀悊锛?/p>
OC
鐨勯暱搴﹀彲浠ユ眰寰楋紝鍒?/p>
CE
鐨勯暱搴﹀嵆鍙眰瑙ｏ紱
锛?/p>
4
锛?/p>
鍙互鍒╃敤鍙嶈瘉娉曪紝
鍋囪
x
杞翠笂瀛樺湪涓�鐐癸紝
浣库柍
CQM
鈮屸柍
CPE
锛?/p>
鍙互璇佸緱
EM=EF
锛?/p>
鍗?/p>
M
涓?/p>
F
閲嶅悎锛?/p>
涓庣偣
E
涓虹洿绾?/p>
y=x
涓婄殑鐐癸紝
鈭?/p>
CEF=45掳
鍗崇偣
M
涓庣偣
F
涓嶉噸鍚堢浉鐭涚浘锛?/p>
鏁?/p>
M
涓嶅瓨鍦紟
銆愯В绛斻�?/p>
瑙ｏ細
锛?/p>
1
锛夎鎶涚墿绾跨殑琛ㄨ揪寮忎负
y=a
锛?/p>
x
锕?/p>
2
锛?/p>
2
+
1
锛屽皢鐐?/p>
A
锛?/p>
0
锛?/p>
2
锛変唬鍏ワ紝寰?/p>
a
锛?/p>
0
锕?/p>
2
锛?/p>
2
+
1=2
锛?/p>
