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Vũ Quỳnh Hương

một mảnh vườn hình chữ nhật có chiều dài bằng 3/2 chiều rộng. các số đo chiều dài và chiều rộng theo đơn vị met là số tự nhiên. biết rằng diện tích của mảnh vườn đó nằm trong khoảng từ 90m2 đến 100m2

Nguyễn Việt Hoàng
3 tháng 8 2017 lúc 16:09

Vì chiều dài bằng 3/2 chiều rộng, nên ta có thể chia hình chữ nhật thành: 3 x 2 = 6 hình vuông nhỏ bằng nhau. Suy ra: Số đo diện tích của hình chữ nhật là một số chia hết cho 6
Từ 90 đến 100 có 2 số chia hết cho 6 là 90 và 96
Nếu diện tích là 90m2 thì mỗi hình vuông nhỏ có diện tích là: 90 : 6 = 15 (m2). Không có hình vuông nào có số đo là số tự nhiên mà có diện tích 15m2 (loại trường hợp này)
Nếu diện tích là 96m2 thì mỗi hình vuông nhỏ có diện tích là: 96 : 6 = 16 (m2). Suy ra mỗi hình vuông nhỏ có cạnh là 4m 
Chiều dài hình chữ nhật là: 4 x 3 = 12 (m)
Chiều rộng hình chữ nhật là:  4 x 2 = 8 (m)
Chu vi hình chữ nhật là: (12 + 8) x 2 = 40 (m)

Bùi Hữu Thanh Phong
13 tháng 11 2015 lúc 19:25

Diện tích là:90m2

Chu vi là: 40m

Chiều dài là: 12m

Chiều rộng là : 8m

Lê Thiên Quân
9 tháng 11 2016 lúc 18:41

diện tích là:90m2                       Chiều dài:12m            Chiều rộng:8            Chu vi: 40

Girl DJ
4 tháng 12 2016 lúc 16:29

dien h la : 90m2

Ngô Minh Nguyệt
30 tháng 1 2017 lúc 11:07

chu vi la 40

Lê Thu Trang
11 tháng 2 2017 lúc 10:26

chu vi là 40 dám chắc luôn

Đinh Thị Hồng Hà
26 tháng 10 2017 lúc 19:54

diện tích phải là 96msao lại là 90m2
mà chiều rộng là 8m chiều dài là 12m thì 12*8 đâu có bằng 90m2

Miamoto Miku
2 tháng 11 2017 lúc 15:33

40 m nha bạn

Ngyuen vu an
7 tháng 11 2017 lúc 19:31

mình chịu thua với bài này rồi !

Nguyễn Quốc Bảo
12 tháng 11 2017 lúc 16:28

40 là đúng 100%

dangkhanhchi
13 tháng 11 2017 lúc 15:02

la 40 100/0

Nguyễn Thái Thịnh
1 tháng 12 2017 lúc 11:17

Chiều dài là 3 phần , chiều rộng là 2 phần và diện tích bằng : 3 * 2 = 6

Từ 90m2 đến 96m2 chỉ có 96m2 là chia hết cho 6.

Suy ra diện tích hình chữ nhật là : 96m2

               Diện tích 1 hình vuông nhỏ là : 96 : 6 = 16 ( m2)

                Diện tích hình vuông = cạnh * cạnh

                Mà 16m2 = 4m2 * 4m2

                Suy ra cạnh hình vuông là 4m

         Chiều dài mảnh vườn hình chữ nhật là : 4 * 3 = 12 ( m )

         Chiều rộng mảnh vườn hình chữ nhật là : 4 * 2 = 8 ( m )

         Chu vi mảnh vườn hình chữ nhật là : ( 12 + 8 ) * 2 = 40 ( m )

                                     Đáp số : 40 m

Hoang Truc Nhi
3 tháng 12 2017 lúc 20:42
Các bạn có biết cách thay đổi hình xuất hiện trên oml.vn không? Bạn nào biết nói cho mình biết nha,please.
Nguyễn Quang Hải và Nguy...
28 tháng 2 2019 lúc 21:22

là 40 minh

Nguyễn Thành Đạt
10 tháng 3 2022 lúc 20:34

40 m đó mình làm rồi đảm bảo đúng 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