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Nguồn:
Người gửi: Trần Ngọc Đồng (trang riêng)
Ngày gửi: 13h:56' 30-12-2021
Dung lượng: 232.5 KB
Số lượt tải: 102
Nguồn:
Người gửi: Trần Ngọc Đồng (trang riêng)
Ngày gửi: 13h:56' 30-12-2021
Dung lượng: 232.5 KB
Số lượt tải: 102
Số lượt thích:
0 người
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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Học sinh không viết vào phần gạch chéo này
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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,
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
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ .....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Học sinh không viết vào phần gạch chéo này
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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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