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Nguyễn Bảo Nam
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Nguyễn Lê Phước Thịnh
4 tháng 12 2021 lúc 14:25

Bài 4:

a: x=-3

b: x=-20

Phương B
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loann nguyễn
13 tháng 8 2021 lúc 22:50

đề đâu bạn???

Hồng Phúc
13 tháng 8 2021 lúc 22:52

Đề?

Nguyễn Lê Phước Thịnh
13 tháng 8 2021 lúc 22:58

Bài 3: 

b: Ta có: CD=CN

mà CN=BM

nên CD=BM

Xét ΔABC có 

\(\dfrac{BM}{BA}=\dfrac{CD}{CA}\)

nên MD//BC

Xét tứ giác BMDC có MD//BC

nên BMDC là hình thang

mà \(\widehat{MBC}=\widehat{DCB}\)

nên BMDC là hình thang cân

Phương B
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Nguyễn Lê Phước Thịnh
13 tháng 8 2021 lúc 22:58

Bài 3: 

b: Ta có: CD=CN

mà CN=BM

nên CD=BM

Xét ΔABC có 

\(\dfrac{BM}{BA}=\dfrac{CD}{CA}\)

nên MD//BC

Xét tứ giác BMDC có MD//BC

nên BMDC là hình thang

mà \(\widehat{MBC}=\widehat{DCB}\)

nên BMDC là hình thang cân

Nguyễn Phương Thùy
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⭐Hannie⭐
26 tháng 3 2023 lúc 17:58

` x xx 1/3 : 2/5 =4/3`

`=> x xx 1/3 = 4/3 xx 2/5`

`=> x xx 1/3 = 8/15`

`=> x= 8/15 :1/3`

`=> x= 8/15 xx 3`

`=> x= 24/15`

`=> x= 8/5`

Thuyy Duongg
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Lee Hà
7 tháng 3 2021 lúc 10:27

đc 12 m

Nguyễn Ngọc Phương Anh
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Đoàn Đức Hà
9 tháng 10 2021 lúc 14:30

Tổng của bốn số là: 

\(46\times4=184\)

Số thứ ba hơn số thứ hai là: 

\(16-8=8\)

Bốn lần số thứ hai là: 

\(184-16-8=160\)

Số thứ hai là: 

\(160\div4=40\)

Khách vãng lai đã xóa
Kiều Anh Nguyễn
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Nguyễn Lê Phước Thịnh
21 tháng 10 2021 lúc 21:14

Bài 3: 

1: Ta có: \(P=\dfrac{\sqrt{x}+1}{\sqrt{x}-2}+\dfrac{2\sqrt{x}}{\sqrt{x}+2}-\dfrac{5\sqrt{x}+2}{x-4}\)

\(=\dfrac{x+3\sqrt{x}+2+2x-4\sqrt{x}-5\sqrt{x}-2}{\left(\sqrt{x}-2\right)\left(\sqrt{x}+2\right)}\)

\(=\dfrac{\sqrt{x}}{\sqrt{x}+2}\)