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dathuyen
2 năm trước
Gọi S là tập hợp tất cả các giá trị nguyên của tham số m thuộc đoạn [−10;3] để hàm số y=−x3−6x2+(m−9)x+2019 nghịch biến trên khoảng (−∞;−1). Hỏi S có bao nhiêu phần tử?
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I. Put the verbs in brackets into the correct form. 1- I (be)......................................................a student 2 years ago. 2- He (be)...................................................... a doctor two years ago. 3- They (be).................................................... farmers last year. 4- Lan and Ba (be) ..........................................nurses last year. 5- It (be not) ................................................ cold yesterday. 6- She (be not) ...........................................a pupipl last week. 7- This hat (be not) ............................................new yesterday. 8- My parents (be not) ..............................................teacchers two years ago. 9- He (be not) ..............................................a mechanic last Monday. 10- The windows (be) ........................open last Monday. 11- Where (be) .................................Nam yesterday? 12- Why (be) ....................................he unhappy last Tuesday? 13 - I (remember)............................. my trip to Nha Trang two years ago. 14 - Ba (wear)............................. the cap all day yesterday. 15 - I (eat) ..........................a lot of fish yesterday. 16 - Her aunt (take)................................... her to see Cham Temple last year. 17 - Tuan (have).............................. a new bike yesterday? 18 - She (not buy) .................................. a new ruler yesterday 19 - He (not talk) .................... with his parents about his vacation in Da Lat last year. 20 - They (not come) .................................. school yesterday?

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