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

( 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