Đề kiểm tra 1 tiết Toán đại số lớp 9 chương 1 - Đề 1 (Có đáp án)
Đề kiểm tra 1 tiết Toán đại số lớp 9 chương 1 - Đề 1 (Có đáp án)
Phần trắc nghiệm (3 điểm)
Câu 1: Điều kiện để 
có nghĩa là:
có nghĩa là:
Câu 2: Kết quả của biểu thức 
là:
là:A.1 - √7 B.√7 - 1 C.2(√7 + 1) D.6
Câu 3: Kết quả của phép tính 
là:
là:A.3 - 2√5 B.2 - √5
C.√5 - 2 D.Kết quả khác
Câu 4: Trục căn thức dưới mẫu của biểu thức: 
ta được kết quả
ta được kết quảA.√7 + √5 B.√7 - √5 C.2(√7 + √5) D.2(√7 - √5)
Câu 5: Giá trị của x để 
là :
là :A.x = 13 B.x = 14 C.x = 1 D.x = 4
Câu 6:Rút gọn biểu thức 
với x < 0;y ≥ 0 ta được:
với x < 0;y ≥ 0 ta được:A.-2x√y B.4x√y C.-4x√y D.4√(x2y)
Phần tự luận (7 điểm)
Bài 1. (2 điểm) Thực hiện phép tính:
a) 2√50 - 3√98 + 4√32 - 5√72
Bài 2. (2 điểm)
a) Tìm x, biết: 
b) Chứng minh:
(với x>0;y>0)Bài 3. (2 điểm)
Cho biểu thức:
a) Rút gọn A.
b) Tìm x để A = 7
Bài 4. (1 điểm) Tìm giá trị nhỏ nhất của biểu thức:
Giải
Phần trắc nghiệm (3 điểm)
| 1.D | 2.B | 3.C | 4.A | 5.D | 6.A |
Phần tự luận (7 điểm)
Bài 1. (2 điểm) Thực hiện phép tính:
a) 2√50 - 3√98 + 4√32 - 5√72
= 10√2 - 21√2 + 16√2 - 30√2
= -25√2
Bài 2. (2 điểm)
Vậy phương trình có nghiệm x = 2; x = - 1
b) Với x > 0; y > 0 ta có:
= (√x + √y)(√x - √y) = x - y
Bài 3. (2 điểm)
Với x > 0;x ≠ 1 ta có:
Bài 4.
Dấu bằng xảy ra khi (√x - 1)2 = 0 ⇔ √x - 1 = 0 ⇔ x = 1
Vậy GTNN của B là (-1)/2,đạt được khi x = 1
Ý kiến bạn đọc
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