閲戞垐閾佸埗鍗?/p>
鍒濅腑鏁板璇曞嵎
鍛ㄥ懆缁?/p>
(13.3)
(
鏃堕棿锛?/p>
45
鍒嗛挓婊″垎锛?/p>
100
鍒?/p>
)
涓�銆侀�夋嫨棰?/p>
(
姣忛
3
鍒嗭紝鍏?/p>
18
鍒?/p>
)
1.
绛夎叞涓夎褰㈢殑椤惰鏄?/p>
80
掳锛屽垯涓�鑵颁笂鐨勯珮涓庡簳杈圭殑澶硅鏄?/p>
(
)
A.40
掳
B.50
掳
C.60
掳
D.30
掳
2.
濡傚浘锛屽湪鈻?/p>
ABC
涓紝鈭?/p>
B=
鈭?/p>
C
锛?/p>
AB=5
锛屽垯
AC
鐨勯暱涓?/p>
(
)
A.2
B.3
C.4
D.5
3
绛夎竟涓夎褰㈢殑涓夋潯瀵圭О杞翠腑浠绘剰涓ゆ潯澶硅鐨勫害鏁颁负
(
)
A.60
掳
B.120
掳
C.60
掳鎴?/p>
120
掳
D.150
掳
4.
濡傚浘
,
宸茬煡
O
鏄洓杈瑰舰
ABCD
鍐呬竴鐐?/p>
,OA=OB=OC,
鈭?/p>
ABC=
鈭?/p>
ADC=70
掳
,
鍒欌垹
DAO+
鈭?/p>
DCO
鐨勫ぇ灏?/p>
鏄?/p>
(
)
A.70
掳
B.110
掳
C.140
掳
D.150
掳