涓嶇鎬庝箞鏍疯鐩镐俊鑷繁锛岀瀛︿笟鏈夋垚锛岄噾姒滈鍚嶏紒
涓嶇鎬庝箞鏍疯鐩镐俊鑷繁锛岀瀛︿笟鏈夋垚锛岄噾姒滈鍚嶏紒
绗洓绔?/p>
鍥惧舰鐨勭浉浼?/p>
2
骞宠绾垮垎绾挎鎴愭瘮渚?/p>
娴嬭瘯鏃堕棿
:25
鍒嗛挓
涓�銆侀�夋嫨棰?/p>
1.(2019
娴欐睙鏉窞鏈熸湯
)
濡傚浘
,
鐩寸嚎
l
1
鈭?/p>
l
2
鈭?/p>
l
3
,
鐩寸嚎
AC
浜?/p>
l
1
銆?/p>
l
2
銆?/p>
l
3
浜庣偣
A
銆?/p>
B
銆?/p>
C,
鐩寸嚎
DF
浜?/p>
l
1
銆?/p>
l
2
銆?/p>
l
3
浜庣偣
D
銆?/p>
E
銆?/p>
F,
宸茬煡
=
,
鑻?/p>
DE=3,
鍒?/p>
DF
鐨勯暱鏄?/p>
(
)
A.
B.4
C.
D.7
绛旀
C
鈭电洿绾?/p>
l
1
鈭?/p>
l
2
鈭?/p>
l
3
,
鈭?/p>
=
.
鈭?/p>
=
,AC=AB+BC,
鈭?/p>
=
=
,
鈭?/p>
EF=
DE=
,
鈭?/p>
DF=DE+EF=
.
鏁呴�?/p>
C.
2.(2017
娌冲崡鍗楅槼鍞愭渤鏈熶腑
)
濡傚浘
,
鐩寸嚎
l
1
鈭?/p>
l
2
鈭?/p>
l
3
,
鐩寸嚎
l
4
銆?/p>
l
5
鍒嗗埆浜?/p>
l
1
銆?/p>
l
2
銆?/p>
l
3
浜庣偣
A
銆?/p>
B
銆?/p>
C
銆?/p>
D
銆?/p>
E
銆?/p>
F,
涓?/p>
EF=4,DE=3,AB=1.2,
鍒?/p>
AC
鐨勯暱涓?/p>
(
)
A.0.9
B.1.6
C.2.8
D.2.1
绛旀
C
鈭?/p>
EF=4,DE=3,
鈭?/p>
DF=7,
鈭?/p>
l
1
鈭?/p>
l
2
鈭?/p>
l
3
,
鈭?/p>
=
,
鍗?/p>
=
,
鈭?/p>
AC=2.8.
鏁呴�?/p>
C.