TÌM X BIẾT ( x - 8 ) . ( x^3 + 8 ) = 0 GIẢI THÍCH RÕ RA GIÚP E VS Ạ . E cảm ơn

2 câu trả lời

Đáp án+Giải thích các bước giải:

 (x-8)(x3+8)=0

(x-8)(x3+23)=0

(x-8)(x+2)(x2-2x+4)=0

x-8=0x=8

    x+2=0x=-2

x2-2x+40

Nên x={8,-2}

(x-8).(x3+8)=0

[x8=0x3+8=0

[x=0+8x3=8

[x=8x=2

        Vy x{-2;8}

Câu hỏi trong lớp Xem thêm

Giúp mk với Bài 1: Chọn đáp án đúng. Example: 0. I was disappointing/disappointed with the film. I had expected it to be better. 1. Are you interesting/interested in football? 2. The football match was very exciting/excited. I enjoyed it. 3. It's sometimes embarrassing/embarrassed when you have to ask people for money. 4. Do you easily get embarrassing/embarrassed? 5. I had never expected to get the job. I was really amazing/amazed when I was offered ot. 6. She has really learnt very fast. She has made astonishing/astonished progress. 7. I didn't find the situation funny. I was not amusing/amused. 8. It was a really terrifying/terrified experience. 9. Why do you always look so boring/bored? 10. He never stops talking and he never says anything interesting/interested. Bài 2: Hoàn thành các câu dưới đây bằng cách sử dụng although/ despite/ in spite of. Example: 0. Although it rained a lot, we enjoyed our holiday. 11. ______________ the weather was cold, we enjoyed our trip. 12. ______________ earning a low salary, Linda gave money to her parents. 13. Hung went to work ______________ not feeling very well. 14. ______________ it was hot, she didn’t put on her hat when going out. 15. ______________ getting up late, she went to class on time. Bài 2: Sử dụng các từ trong ngoặc để viết lại câu sao cho nghĩa không thay đổi. Example: 0. Although Tony learns very hard, he fails this test. (Despite) => Despite learning very hard, Tony fails this test.

1 lượt xem
2 đáp án
16 giờ trước