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Giải Vở bài tập Toán 3 bài 84: Chu vi hình chữ nhật

Thứ năm - 22/08/2019 03:21
Giải Vở bài tập Toán 3 bài 84: Chu vi hình chữ nhật
1.
 giai VBt toan lop 3 bai 84 cau 1
a) Chu vi hình chữ nhật ABCD là:
(17 + 11) x 2 = 56 (cm)
Đáp số: 56cm
b) Chu vi hình chữ nhật có chiều dài lõm, chiều rộng 10m là
(15 + 10) x 2 = 50 (m)
Đáp số : 50m.

2. Một thửa ruộng hình chữ nhật có chiều dài là 140m, chiều rộng là 60m. Tính chu vi thửa ruộng đó.
giai VBt toan lop 3 bai 84 cau 2
Bài giải:
Chu vi thửa ruộng là:
(140 + 60) x 2 = 400 (m)
Đáp số: 400m.

3. Tính chu vi hình chữ nhật có chiều dài là 3dm, chiều rộng là 15cm.
giai VBt toan lop 3 bai 84 cau 3
Bài Giải:
3dm = 30cm
Chu vi hình chữ nhật là:
(30 + 15) x 2 = 90 (cm)
Đáp số: 90cm

4. Đúng ghi Đ, sai ghi S:
giai VBt toan lop 3 bai 84 cau 4
A. Chu vi hình chữ nhật MNPQ bằng chu vi hình chữ nhật EGHI. (Đ)
B. Chu vi hình chữ nhật MNPQ bé hơn chu vi hình chữ nhật EGHI. (S)
C. Chu vi hình chữ nhật MNPQ lớn hơn chu vi hình chữ nhật EGHI. (S)
 
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