1.1
闆嗗悎
鏍稿績鑰冪偣路绮惧噯鐮旀瀽
鑰冪偣涓�
闆嗗悎鐨勫惈涔夊強琛ㄧず
1.
宸茬煡闆嗗悎
A={1,2,4},
鍒欓泦鍚?/p>
B={(x,y)|x
鈭?/p>
A,y
鈭?/p>
A}
涓厓绱犵殑涓暟涓?/p>
(
)
A.3
B.6
C.8
D.9
2.
鑻ラ泦鍚?/p>
A={x
鈭?/p>
R|ax
2
-3x+2=0}
涓彧鏈変竴涓厓绱?/p>
,
鍒?/p>
a=
(
)
A.
B.
C.0
D.0
鎴?/p>
3.
宸茬煡
a,b
鈭?/p>
R,
鑻?/p>
={a
2
,a+b,0},
鍒?/p>
a
2 021
+b
2 021
涓?/p>
(
)
A.1
B.0
C.-1
D.
卤
1
4.(2018
路鍏ㄥ浗鍗封叀
)
宸茬煡闆嗗悎
A={(x,y)|x
2
+y
2
鈮?/p>
3,x
鈭?/p>
Z,y
鈭?/p>
Z},
鍒?/p>
A
涓厓绱犵殑涓暟涓?/p>
(
)
A.9
B.8
C.5
D.4
銆?/p>
瑙?/p>
鏋?/p>
銆?/p>
1.
閫?/p>
D.
闆?/p>
鍚?/p>
B
涓?/p>
鍏?/p>
绱?/p>
鏈?/p>
(1,1),(1,2),(1,4),(2,1),(2,2),(2,4),
(4,1),(4,2),(4,4),
鍏?/p>
9
涓?/p>
.
2.
閫?/p>
D.
鑻ラ泦鍚?/p>
A
涓彧鏈変竴涓厓绱?/p>
,
鍒欐柟绋?/p>
ax
2
-3x+2=0
鍙湁涓�涓疄鏍规垨鏈変袱涓浉绛夊疄鏍?/p>
.
褰?/p>
a=0
鏃?/p>
,x=
,
绗﹀悎棰樻剰
;
褰?/p>
a
鈮?/p>
0
鏃?/p>
,
鐢蔽?/p>
=(-3)
2
-8a=0
寰?/p>
a=
,
鎵�浠?/p>
a
鐨勫彇鍊间负
0
鎴?/p>
.
3.
閫?/p>
C.
鐢卞凡鐭ュ緱
a
鈮?/p>
0,
鍒?/p>
=0,
鎵�浠?/p>
b=0,
浜庢槸
a
2
=1,
鍗?/p>
a=1
鎴?/p>
a=-1,
鍙堟牴鎹泦鍚堜腑鍏冪礌鐨勪簰寮?/p>
鎬у彲鐭?/p>
a=1
搴旇垗鍘?/p>
,
鍥犳
a=-1,
鏁?/p>
a
2 021
+b
2 021
=(-1)
2 021
+0
2 021
=-1.
4.
閫?/p>
A.
鐢?/p>
x
2
+y
2
鈮?/p>
3
鐭?/p>
,-
鈮?/p>
x
鈮?/p>
,-
鈮?/p>
y
鈮?/p>
鍙?/p>
x
鈭?/p>
Z,y
鈭?/p>
Z,
鎵�浠?/p>
x
鈭?/p>
{-1,0,1},y
鈭?/p>
{-1,0,1},
鎵�浠?/p>
A
涓厓绱犵殑涓暟涓?/p>
9.