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Đề kiểm tra 15 phút môn Toán lớp 6 chương 1 - Đề 1 (Có đáp án)

Chủ nhật - 09/09/2018 04:31
Đề kiểm tra 15 phút môn Toán lớp 6 chương 1 - Đề 1 (Có đáp án)

Bài 1. Viết các tập hợp sau bằng cách liệt kê các phần tử:

a) Tập hợp D các số tự nhiên chẵn bé hơn 14.

b) Tập hợp E các số tự nhiên lẻ không lớn hơn 15.

c) Tập hợp F các số tự nhiên lớn hơn 22 bé hơn 38 và chia hết cho 6.

Bài 2. (4 điểm) Tìm x ∈ N, biết:

a) (x - 3) : 2 = 514 : 512

b) 4x + 3x = 30 – 20 : 10

Bài 3. (3 điểm) Có bao nhiêu số tự nhiên lẻ có 5 chữ số?

Đáp án

Bài 1.

a) D = { 0; 2; 4; 6; 8; 10; 12 }

b) E = { 1; 3; 5; 7; 9; 11; 13; 15 }

c) F = { 24; 30 ; 36 }

Bài 2.

a)

(x - 3) : 2 = 514 : 512

(x - 3) : 2 = 52

(x - 3) : 2 = 25

(x - 3) = 25.2

x = 50 + 3

x = 53

b)

4x + 3x = 30 – 20 : 10

7x = 30 - 2

7x = 28

x = 28 : 7

x = 4

Bài 3.

- Số tự nhiên lẻ nhỏ nhất có 5 chữ số là 10001

- Số tự nhiên lẻ lớn nhất có 5 chữ số là 99999

- Khoảng cách giữa hai số lẻ liên tiếp là 2

- Vậy các số lẻ liên tiếp có 5 chữ số là: (99999 – 10001) : 2 + 1 = 45000 (số)

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