Bài 1 :

a, Bằng chiếc xe đạp, em có thể vượt qua những con đường ngoằn nghèo này.

b, Tết đến, tất cả mọi người đều đi chợ để chuẩn bị cho những ngày Tết nhộn nhịp.

mình có 45 xu

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cái đồ trẻ trâu

Bài 6 :

a) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

= (1 + 19) + (3 + 17) + (5 + 15) + (7 + 13) + (9 + 11)

= 20 + 20 + 20 + 20 + 20

= 100

b) 15 × 25 + 25 × 34 + 51 × 25

= 25 × (15 + 34 + 51)

= 25 × 100

= 2500

Bài 5 :

a) cặp cạnh vuông góc là: BA,EA.

cặp cạnh song song là: AB,ED.

mik chỉ bt như vậy thôi mong bạn tick cho mik.

Bài 4 :

Chiều dài khu vườn:

(65 + 5) : 2 = 35 (m)

Chiều rộng khu vườn:

35 - 5 = 30 (m)

a ) Diện tích khu vườn:

35 × 30 = 1050 (m²)

b) Diện tích trồng hoa:

1050 : 3 × 2 = 700 (m²)

Bài 3 :

a) 205 336 + 1 536 : 24 = 205 336 + 64 = 205 400

b) 750 000 + 2325  \(\times\)  4 - 50 300 = 750 000 + 9 300 - 50 300 = 759300 - 50 300 = 709000

Bài 2 :

a) 38 569 034 + 70 728 129 = 109 297 163

b) 3245 762 - 1053 881 = 2191881

c) 13719 x 25 = 342975

d) 3384 : 36 = 94

Bài 1 :

3 phút 20 giây = 200 giây

2 tạ 54 kg = 254 kg > 245 kg

105 yến = 1 tấn 5 yến < 1 tấn 50 yến

1 thế kỉ = 100 năm < 1000 năm

Bài 3 :

Hà Nội là trung tâm chính trị, kinh tế, văn hoá, giáo dục của đất nước vì:

  - Thủ đô Hà Nội là nơi đặt trụ sở làm việc của các cơ quan Trung ương.

  - Hà Nội là trung tâm kinh tế quan trọng của đất nước với nhiều nhà máy, khu công nghệ cao, trung tâm thương mại, hệ thống ngân hàng,…

  - Nơi đây tập trung nhiều trường đại học, viên nghiên cứu, bảo tàng, thư viện,… hàng đầu cả nước.

  - Hà Nội là nơi có nhiều di tích lịch sử - văn hoá và là nơi lưu giữ nhiều giá trị văn hoá truyền thống của dân tộc.