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7
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4
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,
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40
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1
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1
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1
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A
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D
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2
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锛?/p>
A
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5 cm
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3 cm
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1 cm
B
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2 cm
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5 cm
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8 cm
C
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1 cm
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3 cm
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4 cm
D
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1.5 cm
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2 cm
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2.5 cm
3
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4
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4
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6)
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(
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1
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1)
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6)
5
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B
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E
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A. 67.5掳
B. 52.5掳
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D. 75掳
6
锛庡凡鐭?/p>
1
1
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(
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2
2
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2
y
x
b
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鐨勫浘璞′笂鐨勪袱涓偣锛屽垯
1
2
y
y
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鐨勫ぇ灏忓叧绯绘槸锛?/p>
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1
2
y
y
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1
2
y
y
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C
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1
2
y
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D
锛庝笉鑳界‘瀹?/p>
7
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ABC
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BC
鐨勫瀭鐩村钩鍒嗙嚎
l
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鐩镐氦浜庣偣
D
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E
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濡傛灉
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ABD
鐨勫懆闀夸负
10 cm
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BE
=3 cm
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鍒?/p>
鈻?/p>
ABC
鐨勫懆闀夸负
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锛?/p>
A
锛?/p>
9 cm
B
锛?/p>
15 cm
C
锛?/p>
16 cm
D
锛?/p>
18 cm
8
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浠婂勾
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浜斾竴
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鑺傦紝
灏忔槑澶栧嚭鐖北锛?/p>
浠栦粠灞辫剼鐖埌灞遍《鐨勮繃绋嬩腑锛?/p>
涓�斾紤鎭簡涓�娈垫椂闂达紟
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t
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s
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s
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t
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A
锛庡皬鏄庝腑閫斾紤鎭敤浜?/p>
20
鍒嗛挓
B
锛庡皬鏄庝紤鎭墠鐖北鐨勫钩鍧囬�熷害涓烘瘡鍒嗛挓
70
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C
锛庡皬鏄庡湪涓婅堪杩囩▼涓墍璧扮殑璺▼涓?/p>
6600
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D
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