1
璇炬椂璁粌
(
涓?/p>
)
涓�鍏冧簩娆℃柟绋嬪強鍏跺簲鐢?/p>
(
闄愭椂
:35
鍒嗛挓
)
|
澶疄鍩虹
|
1
.
鑻ヤ竴鍏冧簩娆℃柟绋?/p>
x
2
-2
kx
+
k
2
=
0
鐨勪竴涓牴涓?/p>
x=
-1,
鍒?/p>
k
鐨勫�间负
(
)
A
.
-1
B
.
0
C
.
1
鎴?/p>
-1
D
.
2
鎴?/p>
0
2
.
[2019路娉板窞
]
鏂圭▼
2
x
2
+6
x
-1
=
0
鐨勪袱鏍逛负
x
1
,
x
2
,
鍒?/p>
x
1
+
x
2
绛変簬
(
)
A
.
-6
B
.
6
C
.
-3
D
.
3
3
.
[2019路鑱婂煄
]
鑻ュ叧浜?/p>
x
鐨勪竴鍏冧簩娆℃柟绋?/p>
(
k
-2)
x
2
-2
kx
+
k=
6
鏈夊疄鏁版牴
,
鍒?/p>
k
鐨勫彇鍊艰寖鍥翠负
(
)
A
.k
鈮?
B
.k
鈮?
涓?/p>
k
鈮?
C
.k
鈮?/p>
3
2
D
.k
鈮?/p>
3
2
涓?/p>
k
鈮?
4
.
[2019路鑷础
]
鍏充簬
x
鐨勪竴鍏冧簩娆℃柟绋?/p>
x
2
-2
x
+
m=
0
鏃犲疄鏁版牴
,
鍒欏疄鏁?/p>
m
鐨勫彇鍊艰寖鍥存槸
(
)
A
.m<
1
B
.m
鈮?
C
.m
鈮?
D
.m>
1
5
.
鏌愬叕鍙镐粖骞?/p>
4
鏈堜唤鐨勮惀涓氶涓?/p>
2500
涓囧厓
,
鎸夎鍒掔浜屽搴︾殑鎬昏惀涓氶瑕佽揪鍒?/p>
9100
涓囧厓
,
璁捐鍏徃
5,6
涓ゆ湀
钀ヤ笟棰濈殑鏈堝钩鍧囧闀跨巼涓?/p>
x
,
鏍规嵁棰樻剰
,
涓嬪垪鏂圭▼姝ｇ‘鐨勬槸
(
)
A
.
2500(1+
x
)
2
=
9100
B
.
2500(1+
x
%)
2
=
9100
C
.
2500(1+
x
)+2500(1+
x
)
2
=
9100
D
.
2500+2500(1+
x
)+2500(1+
x
)
2
=
9100
6
.
[2019路娌冲寳
]
灏忓垰鍦ㄨВ鍏充簬
x
鐨勬柟绋?/p>
ax
2
+
bx
+
c=
0(
a
鈮?)鏃?/p>
,
鍙妱瀵逛簡
a=
1,
b=
4,
瑙ｅ嚭鍏朵腑涓�涓牴鏄?/p>
x=
-1
.
浠栨牳
瀵规椂鍙戠幇鎵�鎶勭殑
c
姣斿師鏂圭▼鐨?/p>
c
鍊煎皬
2
.
鍒欏師鏂圭▼鐨勬牴鐨勬儏鍐垫槸
(
)
A
.
涓嶅瓨鍦ㄥ疄鏁版牴
B
.
鏈変袱涓笉鐩哥瓑鐨勫疄鏁版牴
C
.
鏈変竴涓牴鏄?/p>
x=
-1
D
.
鏈変袱涓浉绛夌殑瀹炴暟鏍?/p>
7
.
[2019路閯傚窞
]
鍏充簬
x
鐨勪竴鍏冧簩娆℃柟绋?/p>
x
2
-4
x
+
m=
0
鐨勪袱瀹炴暟鏍瑰垎鍒负
x
1
,
x
2
,
涓?/p>
x
1
+3
x
2
=
5,
鍒?/p>
m
鐨勫�间负
(
)
A
.
7
4
B
.
7
5
C
.
7
6
D
.
0
8
.
[2019路濞佹捣
]
宸茬煡
a
,
b
鏄柟绋?/p>
x
2
+
x
-3
=
0
鐨勪袱涓疄鏁版牴
,
鍒?/p>
a
2
-
b
+2019
鐨勫�兼槸
(
)
A
.
2023
B
.
2021
C
.
2020
D
.
2019
9
.
[2019路鎵窞
]
涓�鍏冧簩娆℃柟绋?/p>
x
(
x
-2)
=x
-2
鐨勬牴鏄?/p>
.
10
.
[2019路鐩愬煄
]
璁?/p>
x
1
,
x
2
鏄柟绋?/p>
x
2
-3
x
+2
=
0
鐨勪袱涓牴
,
鍒?/p>
x
1
+
x
2
-
x
1
路
x
2
=
.
11
.
[2019路闈掑矝
]
鑻ュ叧浜?/p>
x
鐨勪竴鍏冧簩娆℃柟绋?/p>
2
x
2
-
x
+
m=
0
鏈変袱涓浉绛夌殑瀹炴暟鏍?/p>
,
鍒?/p>
m
鐨勫�间负
.
12
.
鏌愬湴鍖哄眳姘?/p>
2016
骞寸殑浜哄潎鏀跺叆涓?/p>
20000
鍏?/p>
,2018
骞寸殑浜哄潎鏀跺叆涓?/p>
39200
鍏?/p>
.
鍒欒鍦板尯灞呮皯浜哄潎鏀跺叆鐨勫勾骞?