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Tiểu Thiên Thiên
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15 tháng 6 2022 lúc 20:31

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Oline Math
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Nguyễn Tất Đạt
6 tháng 9 2017 lúc 18:10

A B C M N P Q I K D

Trên tia đối của MP lấy điểm D sao cho MP=MD.

Ta có: \(\Delta\)MBP=\(\Delta\)MCD (c.g.c) => BP=CD (2 cạnh tương ứng)

Mà BP=CQ => CD=CQ  => \(\Delta\)DCQ cân tại C => ^CQD= (1800-^DCQ)/2

=> ^MPB=^MDC (2 góc tương ứng) ở vị trí so le trong => AB//CD => ^DCQ=^IAK (Đồng vị) 

M là trung điểm PD, N là trung điểm PQ => MN là đường trung bình của \(\Delta\)PDQ

=> MN//DQ hay IK//DQ => ^CQD=^AKI (Đồng vị) 

 => \(\Delta\)AIK có: ^AKI= (1800-^IAK)/2 = (1800-^DCQ)/2 = ^CQD

=> Tam giác AIK cân tại A (đpcm)

Nguyễn Xuân Toàn
8 tháng 11 2017 lúc 17:42

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

Lee Linh
29 tháng 7 2020 lúc 22:27

Bạn NX Toàn ơi, bạn bị rảnh ạ, rớt hết phần duyên ra rồi🙃🙃🙃

Khách vãng lai đã xóa
Trần Hà Phương
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hatsune miku
28 tháng 12 2017 lúc 14:52

wefwef

Lê Hải Minh
30 tháng 7 2018 lúc 21:18

này cái bạn nguyễn xuân toàn kia bị gì thế ? họ là hỏi bài mà !

Đỗ Thị Thu Hiền
22 tháng 10 2018 lúc 23:13

ở câu hỏi của bạn Hồ Ngọc Thiện bạn cũng đăng nôi quy và bây giờ câu hỏi của bạn này bạn cũng cho nội quy là sao 

Quân Nguyễn Anh
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nguyễn văn nhật nam
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Cherry
3 tháng 3 2021 lúc 13:48

answer-reply-image

Đây là bài làm tương tự nhé!thanghoa

Mei Mei
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Nguyễn Thị Ngọc Mai
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