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Nguyễn Ngọc Hà
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Thu Hà
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*Nước_Mắm_Có_Gas*
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Trần Dương
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mokona
6 tháng 2 2016 lúc 15:06

vẽ hình nha bạn

Đợi anh khô nước mắt
6 tháng 2 2016 lúc 15:07

ghi từng bài thui

Hoàng Trang
Xem chi tiết
Cao Linh Chi
13 tháng 2 2016 lúc 11:30

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CUTE vô đối
7 tháng 3 2017 lúc 20:37

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

cô nàng bạch dương
18 tháng 3 2017 lúc 12:04

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Trần Thảo Vy
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Nguyễn Linh Chi
22 tháng 11 2019 lúc 23:31

1. Câu hỏi của 1234567890 - Toán lớp 7 - Học toán với OnlineMath

Khách vãng lai đã xóa
Dang Thi Thuy Linh
Xem chi tiết
Nguyễn Lê Phước Thịnh
19 tháng 11 2022 lúc 13:02

a: Xét tứ giác ADHE có

góc ADH=góc AEH=góc DAE=90 độ

nên ADHElà hình chữ nhật

=>góc AED=góc AHD=góc ABC

Ta có: ΔABC vuông tại A

mà AM là trung tuyến

nên MA=MC=MB

=>góc MAC=góc MCA

=>góc MAC+góc AED=90 độ

=>AM vuông góc với DE

b: HE//AB

=>HN//AB

mà góc NAB=góc HBA

nên NHBA là hình thang cân

=>góc ANB=góc AHB=90 độ

=>BN vuông góc với AM

=>BN//DE

Nguyễn Phú Lộc
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Đinh Đức Hùng
8 tháng 3 2017 lúc 15:39

A B C M D E I 1 2

a ) Xét ∆ BDM và ∆ CEM có :

∠D = ∠E = 900 (gt)

BM = MC (gt)

∠M1 = ∠M2 ( đối đỉnh )

=> ∆ BDM = ∆ CEM ( CH - GN )

=> BD = CE ; DM = EM ( Cạnh tưng ứng )

b ) Trên tiam AM lấy điểm I sao cho AM = MI 

Xét ∆ ABM và ∆ ICM có :

AM = MI (gt)

∠M1 = ∠M2 ( đối đỉnh )

BM = MC (gt)

=> ∆ ABM = ∆ ICM (c - g - c)

=> AB = CI ( Cạnh tưng ứng )

∆ ACI có AC + CI > AI ( bđt tam giác)

Mà AM = 1/2AI => AC + CI > 2AM

Mà AB = CI (cm trên) => AB + AC > 2AM (đpcm)

Nguyễn Tuấn Vũ
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Nguyễn Lê Phước Thịnh
27 tháng 1 2022 lúc 21:13

a: Xét ΔAMD vuông tại M và ΔAND vuông tại N có

AD chung

\(\widehat{MAD}=\widehat{NAD}\)

Do đó: ΔAMD=ΔAND

Suy ra: AM=AN

b: Xét ΔABC có AD là đường phân giác

nên BD/AB=CD/AC

mà AB>AC

nên BD<CD