Đáp án+Giải thích các bước giải:
`(x^2-3)(x^4+3x^2+9)`
`=(x^2-3)[(x^2)^2+3.x^2+3^2]` (áp dụng HĐT số `7`)
`=(x^2)^3-3^3`
`=x^6-27`
`=x^2(x^4+3x^2+9)-3(x^4+3x^2+9)`
`=x^6+3x^4+9x^2-3x^4-9x^2-27`
giúp em 2 bài này với ạ mng :(((
Ex 4. Write the correct form of the verb in brackets. 1. _________________(you/eat) fried chicken last night? 2. He ________________(put) on a lot of weight recently. 3. I often ___________(drink) coca cola when I was a child. 4. Joane _____________(wash) her face regularly to prevent spots. 5. I think he ______________(not pass) the exam. He hasn’t studied at all. 6. She _____________(have) a sore throat, and she __________(cough) terribly now. 7. You should try ____________(exercise) a couple times aweek. 8. He keeps ____________(sneeze), so I think he’s got a cold. 9. What ____________(you/ do) tomorrow evening? 10. My mother doesn’t like___________(eat) fast food. Ex 5. Supply the correct form of the verb in brackets. 1. The Japanese eat____________, so they have high life expectancy. (health) 2. Drinking unclean water can cause____________. (sick) 3. My uncle is a__________. He doesn’t eat meat or fish. (vegetable) 4. __________________can increase the risk of heart disease and diabetes (obese) 5. I’m _________to shellfish, so I can’t eat lobster and shrimp. (allerfy) 6. I got ____________during my beach vacation. (sunburn) 7. Lack of vitamin E can cause skin diseases and ______________(tired) 8. The symptoms of the disease include fever and ______________. (head)
cho a = 13/15+13/35+13/63+13/99
. Rewrite the sentences: 1. Her old house is bigger than her new one. -> Her new house……………………………………......... 2. No one in my class is taller than Peter. -> Peter ………………………………………………. 3. The black dress is more expensive than the white one. -> The white dress …………………………………………… 4. According to me, English is easier than Maths. -> According to me, Maths …………………………………. 5. No one in my group is more intelligent than Mary. -> Mary …………………………………………………… 6. No river in the world is longer than the Nile. -> The Nile ………………………………………………….. 7. Mount Everest is the highest mountain in the world. -> No mountain ……………………………………………... 8. This is the first time I have ever met such a pretty girl. -> She is ………………………………………………
Cần giúp gấp nha mng ( đây là câu trần thuật )
Đem giao phối ruồi giấm thân xám cánh thẳng vs 2 ruồi giấm cái -Con ruồi cái thứ nhất thân xám cánh cong. Thu đc F1 150 con thân đen cánh thẳng, 149 con thân đen cánh cong, 437 con thân xám cánh thẳng và 445 con thân đan cánh cong -Con ruồi cái thứ 2 thân xám cánh thẳng. Thu đc F1 340 con thân xám cánh thẳng, 120 con thân xám cánh cong a/ Giải thích kết quả trên và viết sơ đồ lai. Viết các cặp gen qui định cặp tính trạng tương phản trên những nhiễm sắc thể thường b/Làm thế nào để xác định kiểu gen của ruồi giấm đen cánh thẳng?
Tìm x: X^4=x^2. Nhanh giúp mình vote 5 sao
Read the text and complete the gaps with one word only. An ideal park Do you (31) Answer there was a park for young people where you live? Well, in Boulder, Colorado, USA, people your age were asked (32) Answer they would like to see in city parks. Top of the list was WiFi. ‘I couldn't do my homework (33) Answer there was a study space with WiFi,’ said Kim. They'd also like to see more cafes (34) Answer that they offer a wide range of food options. Young people also wanted places (35) Answer they could create art, such as a graffiti wall. Also important were play spaces on (36) Answer that they were for all ages, not just young children. ‘I’d like to see ping-pong tables,’ and ‘It (37) Answer be fantastic if there was a zip wire,’ were some of the comments. They also wanted to listen to music so we showed them a park whereyoung people could connect their own phone to a music system, hang out and dance. 'If (38) Answer our park had one! We’d go there all the time!' Important to this age group is safety, and they asked for lighting in (39) Answer they were in the park after dark. Lastly, water features were popular. ‘If we (40) Answer those, we could play with our younger brothers and sisters in them.’ said Kelly.
Tìm x biết: x : 2 : 3 = 782 X 6
Mầm đi ạ ! NL : Chòi oi , copy bài là sai ròi mà lại còn bảo mk đần đc thì chịu ròi
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