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Khắc phục hiện tượng không xuất hiện menu Bộ công cụ Violet trên PowerPoint và Word

12099162 Kính chào các thầy, cô. Khi cài đặt phần mềm , trên PowerPoint và Word sẽ mặc định xuất hiện menu Bộ công cụ Violet để thầy, cô có thể sử dụng các tính năng đặc biệt của phần mềm ngay trên PowerPoint và Word. Tuy nhiên sau khi cài đặt phần mềm , với nhiều máy tính sẽ...
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Người gửi: Trần Ngọc Đồng (trang riêng)
Ngày gửi: 13h:56' 30-12-2021
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PHÒNG GIÁO DỤC VÀ ĐÀO TẠO
THIỆU HOÁ
 ĐỀ KIỂM TRA CUỐI HỌC KÌ I
NĂM HỌC 2021 - 2022

Số báo danh: ………………
Môn: Toán – Lớp 7
(Thời gian làm bài 90 phút)

Trường:…………….…………….………Lớp……………
Họ tên:………………………………………….............……..
Giám thị số 1:………….....….…………….
Giám thị số 2:……………......…………….
Số phách

----------------------Chủ tịch hội đồng chấm thi cắt phách theo đường kẻ này------------------------

Điểm của bài thi
Giám khảo số 1:…………….…………….
Số phách

Bằng số
Bằng chữ





Giám khảo số 2:…………………….…….


( Học sinh làm bài trực tiếp vào tờ đề thi này )
ĐỀ BÀI
Bài 1: (2 điểm). Thực hiện các phép tính sau:
a)  b) 
c) 
Bài 2: (2 điểm). Tìm x biết:
a)  b) 
Câu 3: (1,5 điểm). Số đo ba góc của một tam giác tỉ lệ với 4;6;8. Tính số đo mỗi góc của tam giác đó?
Câu 4: (3,5 điểm). Cho tam giác ABC vuông tại A, kẻ AD vuông góc với BC (D thuộc BC). Trên đường thẳng vuông góc với BC tại C lấy điểm E sao cho CE = AD (E và A thuộc hai mặt khác phía bờ chứa cạnh DC). Chứng minh rằng:
a) 
b) 
c) 
Bài 5: (1,0 điểm). Cho dãy tỉ số bằng nhau: 
Chứng minh rằng:  có giá trị nguyên.
BÀI LÀM

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PHÒNG GD&ĐT THIỆU HOÁ ĐÁP ÁN ĐỀ KHẢO SÁT CL CUỐI HỌC KÌ I
NĂM HỌC 2020 - 2021

Môn : TOÁN – Lớp 7

Câu
Đáp án
Biểu điểm

Câu1: a

0,5 đ



b

0,75 đ


c
=  = 
0,75 đ


Câu2: a
a. 

Vậy 


0,5 đ

0,5 đ

b
b. 

Trường hợp 1: 
Trường hợp 2: 
Vậy  ; 



0,25 đ
0,25 đ
0,25 đ
0,25 đ

Câu 3

Gọi số đo ba góc của tam giác là a, b, c (a ,b , c >0 )
Ta có: 
Và a + b + c = 1800 (Tổng ba góc của tam giác)
Áp dụng tính chất dãy tỉ sô bằng nhau ta có:

( 


Vậy: Số đo ba góc của tam giác đó là: 400, 600, 900.

0,25đ


0,25đ

0,25đ

0,25đ

0,25đ

0,25đ


Câu 4
HS vẽ hình, viết GT, KL
0,5đ

a
 Xét tam giác ADC và tam giác DCE có:
DC chung
AD = CE (GT)



0,25đ
0,25đ
0,25đ
0,25đ

b
 Ta có:  ( 2 góc tương ứng)
Vì DC cắt AC và DE mà trong các góc tạo thành có cặp góc  và  nằm ở vị trí hai góc so le trong và bằng nhau nên  ( Dấu hiệu nhận biết hai đường thẳng song song)
Mặt khác: ( Quan hệ từ vuông góc đến song song)
0,25đ
0,25đ
0,25đ
0,25đ


c
 Xét tam giác BAD vuông tại D có:  (1)
Mà  (Tam giác ABC vuông) (2)
Từ (1), (2)  (3)
Mặt khác:  ( 2 góc tương ứng)(4)
Từ (3) và (4) 

0,5đ

0,
 
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