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De kiem tra HK 2 Toan 10

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TRNG TRUNG HC PH THễNG THANH BèNH 1
ON TAP
HOẽC KYỉ 2
KHOI 10.
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A Trong mặt phẳng với hệ tọa độ Oxy. Cho 3 điểm A, B, C không thẳng hàng có tọa độ là
A(2; 7) B (1; 2) và C(6;-1)
1) Lập phơng trình đờng cao AH kẻ từ đỉnh A của tam giác ABC.
2) Lập phơng trình đờng thẳng

đi qua điểm A và cách điểm B một khoảng bằng 1./// ijjj
F
I+TU2V!:W>
2@:F>@AB#$-'7?#@AB#$-/

)
) 0x x x

+ =
OA
O
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x
x
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0
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b( X0 O) TT X( bb bc O3
XT TT Xb XT T( b( X c(
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[
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2 2
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O3) =+x
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) )

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x y
− =
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α α
α
2
tan2 +cot2
Rót gän biÓu thøc : A =
1+cot 2

π
α
sau ®ã tÝnh gi¸ trÞ cña biÓu thøc khi = .
8
A5"7!9#51%9=[ W@y#9eD`
α
/
O
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2 2
2
cot 2 cos 2 sin2 .cos2
cot2
cot 2
A
α α α α
α
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