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Geometr11 2
Dec 9, 2011
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1.
仂亟仍仂亞仂 28 丐亞
唏仆唏亞 仗舒舒仍仍亠仍亠 仗亳仗亠亟亳亶仆 亞于舒仆 仄亢亳亶亞 a, b, c 亞亠. 舒 ) = 22, = 32, = 52, 弍仂仍 亞亞 =? 弍) = 2 5 3弍舒 亞亞 = 1550 弍仂仍 a, b, c 仂仍. D1 C1 哦亞唏仆 仆:丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠 仗亳仗亠亟, 仄亢亞 A1 B1 a,b,c = 22, = 32, = 52, 仍仂 仆: 亞亞 =? 仂亟仂仍: 1) 達達 = +2 = +2 = 2 D C ( + ) +2 =2 +2 +2 = 2( + + A b a B ) = 2 22 52 + 32 52 + 22 32 = 2 (20 + 30 + 12) = 2 62 = 124 弍)哦亞唏仆 仆:丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠 仗亳仗亠亟, 仄亢亞 a,b,c = 2 5 3弍舒 亞亞 = 1550 仍仂 仆: a,b,c - ? =2 仂亟仂仍: 1) = 2 5 3 =5 =3 2) 亞亞 = +2 = +2 = 2( + ) + 2( + ) = 2( + + ); 1550 = 2( + + ) 2 775 = + + 775 = 2 3 + 5 3 + 2 5 775 = 6 + 15 + 10 31 = = 25 = 25 = 5 = 5 3) = 2 = 2 5 = 10 = 5 = 5 5 = 25
2.
= 3 =
3 5 = 15 丱舒亳: 10; 25; 15 仂亟仍仂亞仂 29 D1 C1 哦亞唏仆 仆:丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠仗亳仗亠亟, = = 16仄 = = 10仄 = = 12 A1 B1 仍仂 仆: =? 仂亟仂仍: 1) = =? D C 2) 丐亞 唏仆唏亞 = + = A B 122 + 162 = 20 1 = 20 仄 3) = = 10単狸 20単狸 = 200 仂亟仍仂亞仂 30 丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠仗亳仗亠亟亳亶仆 3 仄亢 勵勵仆亳亶 亟亳舒亞仂仆舒仍亳亟亞 仂仍. 舒)2; 22 ; 2弍)1,2; 5; 1,6于)8; 9; 12 哦亞唏仆仆:丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠仗亳仗亠亟 亟亳舒亞仂仆舒仍 仆 2 2+ 2 2 = + 弍舒亶仆舒. = + + 仂亟仂仍: 舒) 丱仄亢 仆2; 22 ; 2 弍仂仍 = 2 + 22 + 2 = 4 + 8 + 4 = 16 = 4 弍) 1,2; 5; 1,6 仄亢 亟亳舒亞仂仆舒仍亳亶亞 仂仍弍仂仍 = + + = 1.2 + 1.5 + 1.6 = 1.44 + 2.25 + 2.56 = 6.25 = 2.5仄 于)8; 9; 12 仄亢 弍仂仍 d = ? = 8 + 9 + 12 = 64 + 81 + 144 = 289 = 17 丱舒亳:4; 2.5; 17 仂亟仍仂亞仂 31 丐亞 唏仆唏亞 仗舒舒仍仍亠仍亠仗亳仗亠亟亳亶仆 亳亶仆 舒仍亟 仆 16 仄 弍舒 18仄, 唏仆亟唏 34 仄 弍仂仍 勵勵仆亳亶 亞勵亶亟 亞舒亟舒亞亞亳亶仆 舒仍弍舒亶亞 舒亢 亞舒亟舒亞亞亳亶仆 舒仍弍舒亶亟 舒仍舒仆 舒舒舒亞 仂仍.
3.
A1
D1 C1 哦亞唏仆 仆: ABCDA1 B1 C1 D1亞 唏仆唏亞 B1 仗舒舒仍仍亠仍亠仗亳仗亠亟 HD=16 仄; AB= 18 仄 ; 1 = 34仄; D C 2 2+ 2 2 弍舒亶仆舒. = + = + + A B 仍仂 仆: 達達 =? 仂亟仂仍: 舒) = +2( + ) = 2(16 + 18) 34 = 2 34 34 = 2312 弍) 達達 = +2 = 2312 + 2 16 18 = 2312 + 576 = 2888 達達 于) = =1 ; 丱舒亳:1 ; 仂亟仍仂亞仂 35 丿仍仆 仗舒舒仍仍亠仍亠仗亳仗亠亟亳亶仆 亳亶仆 舒仍亟 17 仄 弍舒 28 仄, 亳亶仆 仆亞 亟亳舒亞仂仆舒仍 25 仄 弍唏亞唏唏亟 亟亳舒亞仂仆舒仍 仂亞仍仂仍亟仆 舒仍弍舒亶仆 仆亳亶仍弍亳亶亞 亳亶仆 舒仍弍舒亶亟 舒仍舒仆 舒舒舒 16:15 弍仂仍仆仂. 亳舒亞仂仆舒仍 仂亞仍仂仍仆 舒仍弍舒亶亞 仂仍. D1 C1 O1 哦亞唏仆 仆: 丿仍仆 仗舒舒仍仍亠仍亠仗亳仗亠亟 ABCDA1 B1 C1 D1 A1 B1 弍舒 仆 仗舒舒仍仍亠仍亞舒仄仄. AD=17 仄; AB= 28 仄 ; BD = 25仄; 1 1 + 1 1 16 = D C 15 A O 仍仂 仆: 1 1 =? 1 1 =? B 2 2 仂亟仂仍: 舒)仗舒舒仍仍亠仍亠仗亳仗亠亟亳亶仆 仆 仗舒舒仍仍亠仍亠仍亞舒仄仄 舒舒 + = 2 ( 2 + 2 ) 弍舒亶仆舒. 2 2 + 25 = 2 172 + 282 2 + 625 = 2(289 + 784) 2 = 2(289 + 784) 625 = 2 1073 625 2146 625 = 1521 2 = 1521 = 1521 = 39
4.
2) 弌亳亶仆 舒仍弍舒亶亞
仂仍仂仆 仍亟 仂 亞于舒仍亢亳仆 弍仂仍亞仂于仂仍 亞于舒仍亢仆 舒仍弍舒亶亞 亠亠仂仆 仂仄仂亞仂仂 弍仂亟亠. 17 + 28 + 25 = = 35 2 = ( )( )( ) = 35(35 17)(35 28)(35 25) = 35 18 7 10 = (5 7)(9 2) 7 (2 5) = 5 7 2 3 = 210 = 210 弌亳亶仆 仗舒舒仍仍亠仍亠仍亞舒仄仄仆 舒仍弍舒亶: S =2 210 = 420 3)丿仍仆 仗亳亰仄亳亶仆 唏仆亟唏 1= H 亞于仍 = = 64 16 420 16 = = = 7 =7 420 15 15 64 4) 1 1 = 1 = 39 7 = 273 仄2 = 1 = 25 7 = 175 仄2 丱舒亳:273 仄 , 175 仄