22.1. 2
浜屾鍑芥暟
y=ax
虏鐨勫浘鍍忓拰鎬ц川
1.
鎶涚墿绾?/p>
y=2x
2
锛?/p>
y=-2x
2
锛?/p>
y=
2
1
x
2
鐨勫叡鍚屾�ц川鏄?/p>
( )
A.
寮�鍙ｅ悜涓?/p>
B.
瀵圭О杞存槸
y
杞?/p>
C.
閮芥湁鏈�楂樼偣
D.y
闅?/p>
x
鐨勫澶ц�屽澶?/p>
2.
鍏充簬鍑芥暟
y=3x
2
鐨勬�ц川琛ㄨ堪姝ｇ‘鐨勪竴椤规槸
( )
A.
鏃犺
x
涓轰换浣曞疄鏁帮紝
y
鐨勫�兼�讳负姝?/p>
B.
褰?/p>
x
鍊煎澶ф椂锛?/p>
y
鐨勫�间篃澧炲ぇ
C.
瀹冪殑鍥捐薄鍏充簬
y
杞村绉?/p>
D.
瀹冪殑鍥捐薄鍦ㄧ涓�銆佷笁璞￠檺鍐?/p>
3.
宸茬煡鐐?/p>
(-1
锛?/p>
y
1
)
锛?/p>
(2
锛?/p>
y
2
)
锛?/p>
(-3
锛?/p>
y
3
)
閮藉湪鍑芥暟
y=x
2
鐨勫浘璞′笂锛屽垯
( )
A.y
1
<y
2
<y
3
B.y
1
<y
3
<y
2
C.y
3
<y
2
<y
1
D.y
2
<y
1
<y
3
4.
宸茬煡浜屾鍑芥暟
y=(m-2)x
2
鐨勫浘璞″紑鍙ｅ悜涓嬶紝鍒?/p>
m
鐨勫彇鍊艰寖鍥存槸
____.
5.
涓嬪垪鍥涗釜浜屾鍑芥暟锛氣憼
y=x
2
锛屸憽
y=-2x
2
锛屸憿
y=
2
1
x
2
锛屸懀
y=3x
2
锛屽叾涓姏鐗╃嚎寮�鍙ｄ粠澶у埌
灏忕殑鎺掑垪椤哄簭鏄?/p>
____.
6.
宸茬煡
鏄簩娆″嚱鏁帮紝
涓斿綋
x
锛?/p>
0
鏃讹紝
y
闅?/p>
x
澧炲ぇ鑰屽澶э紝
鍒?/p>
k= .
7.
鍒嗗埆姹傚嚭绗﹀悎涓嬪垪鏉′欢鐨勬姏鐗╃嚎
y=ax
2
鐨勮В鏋愬紡锛?/p>
(1)
缁忚繃鐐?/p>
(-3
锛?/p>
2)
锛?/p>
(2)
涓?/p>
y=
3
1
x
2
寮�鍙ｅぇ灏忕浉鍚岋紝鏂瑰悜鐩稿弽
.
8.
浜屾鍑芥暟
y=ax
2
涓庣洿绾?/p>
y=2x-1
鐨勫浘璞′氦浜庣偣
P(1
锛?/p>
m).
(1)
姹?/p>
a
锛?/p>
m
鐨勫�硷紱