kiem tra dai so 9 chuong 1

<span class='text_page_counter'>(1)</span>Họ và tên: .............................................. Lớp: 9C. KIỂM TRA 1 TIẾT -1. Môn: TOÁN Thời gian: 45 phút. ĐIỂM. LỜI PHÊ CỦA CÔ GIÁO. C©u 1: ( 3điểm) Tính x để căn thức có nghĩa: a. √ x −3 b. √ −7 x C©u 2: ( 3điểm) Thùc hiÖn phÐp tÝnh a.. √ 25. √ 34 . √56. C©u 3: (3 ®iÓm): Cho biÓu thøc:. c. b.. A=. 2. 2 ( 1+1√ x + x −1 ) : x −2√√xx +1. √ 4 x +12. √. 1 − √ 32+ √ 72 2. ; với x 0. và x 4. a.Tính A biết x = 8 b. Tìm x để A >0 c. Tìm x để A có giá trị bằng 6 Câu 4: (1 điểm) Tìm số x nguyên để biểu thức Q =. √ x+1 nhËn gi¸ trÞ √x− 1. nguyªn............................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................. . 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<span class='text_page_counter'>(2)</span> 1  B   x  2 x  C©u 3: (3 ®iÓm): Cho biÓu thøc: a.Tính B biết x = 9 b. Tìm x để B > 0 1 c. Tìm x để A có giá trị bằng 3 Câu 4: (1 điểm) Tìm số x nguyên để biểu thức Q =. 1  1 x : x  2  x  4 x  4 ; với x  0; x 1. x1 x  1 nhËn gi¸ trÞ nguyªn.. ................................................................................................................................................................................................................................................................. . ................................................................................................................................................................................................................................................................. . ................................................................................................................................................................................................................................................................. . 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