9 giờ 5 phút = 545 phút

4 ngày 4 giờ = 100 giờ

1/5 phút = 12 giây

1/4 phút = 15 giây

1/3 giờ = 20 giây

1/4 thế kỉ = 25 năm

bằng 66666666

= 66666666

Diện tích mỗi hình vuông nhỏ là
100 : 4 = 25 ( cm2 )
Ta có 25 = 5 x 5
=> cạnh của mỗi hình vuông nhỏ là 5 cm
Chu vi hình vuông nhỏ là 5 x 4 = 20 ( cm )
Đáp số : 20 cm

1053 năm

nhanh lên nhé

9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

có 3 hàng và 3 lớp

Tổng 4 số là :

200 x 4 = 800

Tổng của 5 số là :

800 + 2010 = 2810

TBC của 5 số là :

2810 : 5 = 562

Số bé nhất có bốn chữ số giống nhau là: 1111

Số lớn nhất có bốn chữ số khác nhau là: 9876.

Gọi số đó là: x.

Ta có:

x * 5 + 1111 = 9876

HT

x * 5 = 9876 - 1111

x * 5 = 8765

x      = 8765 : 5

x      =   1753.

mọi người trả lời nhanh hộ mình , mình cờn gấp nha

Nguyễn Trãi sinh năm :

1980-600=1380.

Đáp số: 1380.

Số bé nhất có bốn chữ số khác nhau là: 1023.

 Số bé nhất có sáu chữ số là: 100 000.

Số đó là :

100 000x5-1023=498977.

Đáp số: 498977.