hãy cho biết thành phần hóa học của oxi

Finish the second sentences so that it has the same meaning as the first one. 1, The teacher was angry with her students because they were so lazy and untidy → Because of the students' _____________________________ 2, We have nowhere to sit and rest because there aren't any benches in the school garden. (hint: use the word "available" → Because of no _____________________________ 3, Some students don't want to answer the questions during class because of being afraid of making mistakes. → Because some students _____________________________ 4, I couldn't go to school two days ago because of having the terrible flu. → Because I _____________________________ 5, Mr. Thomas won't be able to sleep well tonight because of needing to prepare some question for the exam. → Because Mr. Thomas _____________________________ 6, Because of the warm and sunny weather, the Robinsons decided to go for a picnic. → Because it _____________________________ 7, Because of the wet and muddy ground, the football players had difficulty playing the match. → Because the _____________________________

tìm giá trị của m để phương trình sau vô nghiệm: 2mx-x=1+m

thu gọn các biểu thức sau a) 7x-19x+6x b)-ab-ba-ca-ca

Các bạn giải giúp mình câu 67 với

tìm x thuộc Z biết x(x+3)=0 (x-2)(5-x)=0 (x-1)(x^2+1)=0

Finish the second sentences so that it has the same meaning as the first one. 1, He crashed his car because he was driving too fast. → Because of _________________________________________ 2, Steven went to the shopping center last Sunday because he needed a new laptop. → Because of _________________________________________ 3, Pam and her parents want to visit the city zoo because they want to see the baby panda. → Because of _________________________________________ 4, More and more people get to work late every day because the traffic in the city center is so heavy. → Because of _________________________________________ 5, It's difficult to breathe in this industrial area because there is smoke from the factories. → Because of _________________________________________ 6, We would like to go to the cinema this Saturday because there is a nice animation for kids. → Because of _________________________________________ 7, Nowadays teenagers gain weight or become obese because they prefer fast food to healthy home cooked food. → Because of _________________________________________

Tổng độ dài hai cạnh hình chữ Nhật gấp 5 lần hiệu độ dài hai cạnh đó. Hãy tính diện tích hình chữ Nhật đó, biết hiệu độ dài hai cạnh là 15m.

Complete the following sentences with the correct form of the verbs in the box happen reduce save suffer cause throw take be change see 1, If we use less private vehicles, we ____________ the amount of carbon dioxide into the air. 2, If you ____________ the president, what would you do to prevent air pollution? 3, If there were no fresh water left, what ____________ ? 4, If people (not) ____________ rubbish in the street, it would look better. 5, If there wasn't so much light in the cities at night, we ____________the stars more clearly. 6, If the water is contaminated, people____________ from many diseases. 7, If chemicals from factories are dumped into rivers and lakes, they ____________ water pollution. 8, If people want to protect their planet, they should ____________ their habit of using plastic bags for convenience. 9, If we recycle paper, we ____________ 1000 trees a day. 10, If people were more aware of the negative consequences of pollution, they might ____________ actions to prevent it.

Câu 23: Cho phương trình: x² +2mx +4=0. Tìm m để phương trình đã cho có 2 nghiệm x_1,x_2 thỏa mãn x_1^4+x^2^4 nhỏ hơn bằng 32. Câu 25: Trong mp Oxy cho tam giác ABC với A(1;5),B(-4;–5),C(4;-1). Tìm tọa độ tâm của đường tròn nội tiếp tam giác ABC. Các bạn giải giúp mình câu 23 và câu 25 với ạ . Mình cảm ơn.