鍐�鏁欑増
2019
骞村叓骞寸骇鏁板鏆戝亣寮�瀛﹁�冭瘯鏁板娴嬭瘯棰?/p>
B
锛堥檮绛旀锛?/p>
1
锛庤
x
锛?/p>
0
锛?/p>
x
锕?
锛屽垯浠ｆ暟寮?
鐨勫�硷紙
锛?/p>
A
锛?/p>
1
B
锛?/p>
C
锛?/p>
D
锛?/p>
2
锛庤嫢瀹氫箟杩愮畻
a
鈯?/p>
b
=|2
a
鈥?/p>
b
|
锛屽垯
2
鈯?/p>
[
锛?/p>
鈥?/p>
5
锛?/p>
鈯?/p>
锛?/p>
鈥?/p>
7
锛?/p>
]
鐨勫�兼槸锛?/p>
锛?/p>
A
锛?/p>
1
B
锛?/p>
7
C
锛?/p>
13
D
锛?/p>
25
3
锛庡鍥撅紝鍦?/p>
鈻?/p>
ABC
涓紝
鈭?/p>
ABC
=40掳
锛?/p>
鈭?/p>
ACD
=76掳
锛?/p>
BE
骞冲垎
鈭?/p>
ABC
锛?/p>
CE
骞冲垎
鈻?/p>
ABC
鐨?/p>
澶栬
鈭?/p>
ACD
锛屽垯
鈭?/p>
E
锛?/p>
锛?/p>
A
锛?/p>
40掳
B
锛?/p>
36掳
C
锛?/p>
20掳
D
锛?/p>
18掳
4
锛庝笅鍒楀悇寮忕殑璁＄畻缁撴灉涓紝鏄垎寮忕殑鏄紙
锛?/p>
鈶?/p>
x
b
y
a
飪?/p>
锛涒憽
x
y
y
x
飪?/p>
鈶?/p>
6
2
x
x
飪?/p>
鈶?
2
3
a
a
b
b
飪?/p>
.
A
锛?/p>
鈶?/p>
B
锛?/p>
鈶犫懀
C
锛?/p>
鈶♀懀
D
锛?/p>
鈶犫憿鈶?/p>
5
锛庝笅鍒楃害鍒嗘纭殑鏄紙
锛?/p>
A
锛?/p>
B
锛?/p>
C
锛?
D
锛?
6
锛庡湪鏁板娲诲姩璇句腑鑰佸笀鍑轰簡杩欐牱涓�閬撻鐩鍚屽浠璁猴細鐜版湁閾佷笣閲?/p>
m
1
鍏嬶紝閾滀笣閲?/p>
m
2
鍏嬶紝閾佷笣銆侀摐涓濈殑鎴潰鍗婂緞鍒嗗埆涓?/p>
r
1
cm
鍜?/p>
r
2
cm,
涓嶇敤鐩存帴娴嬮噺闀垮害锛屽垎鍒绠楀畠浠?/p>
鐨勯暱搴︼紙閾佺殑瀵嗗害涓?/p>
7.8g/cm3,
閾滅殑瀵嗗害涓?/p>
8.9g/cm3
锛夋纭殑鍥炵瓟鏄?/p>
(
)
A
锛庨搧涓濅负
cm
閾滀笣涓?/p>
cm
B
锛庨搧涓濅负
cm
閾滀笣涓?/p>
cm
C
锛庨搧涓濅负
cm
閾滀笣涓?/p>
cm
D
锛庨搧涓濅负
cm
閾滀笣涓?/p>
cm
7
锛庝笅鍒楄繍绠楁纭殑鏄紙
锛?/p>
A
锛?
B
锛?/p>
x
3
鈥
2
=x
6
C
锛?/p>
2x
4
梅
x
2
=2x
2
D
锛?/p>
锛?/p>
3x
锛?/p>
2
=6x
2
8
锛庝笉绛夊紡
4
锕?/p>
2x鈮?
鐨勮В闆嗗湪鏁拌酱涓婅〃绀轰负锛?/p>
锛?/p>