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killuazoldyck105
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Phân tích các đa thức sau thành nhân tử : 1, x^3 - 2x^2 + 5x 2, 3x(x-1) + 5(x-1) 3, 2x^2(x+1)+4(x+1) 4, -3x-6xy+9xz 5, 2x ^ 2 y - 4xy^2+6xy 6, 4x^3y^2-8y^2y^3+2x^2y 7, 9x^2y^3-3x^4y^2-6x^3y^2+18xy^4 8, 7x^2y^2-21xy^2z+7xyz-14xy 9, a^3x^2y-5/2a^3x^4+3/2a^4x^2y
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Rewrite the sentences using questions words and to-infinitives. 1. I don't know what I should review first for the coming test. 2. Mary can't decide whether she should go to the school library or stay at home to do her homework. 3. Please tell me how I can get to the bus station. 4. Jim told us where we could find that atlas. 5. He told me when I should come to the meeting. 6. The plumber told me how I could fix the leak in the sink. 7. Please tell me where I should meet you tomorrow morning. 8. Jim found two shirts he liked, but he had trouble deciding which one he should buy. C. READING I. Read the passage, and do the tasks that follow. Nick's voice is changing. It is one of the many developments that happen to both girls and boys when they reach puberty: a boy’s voice gets deeper than a girl's. At puberty, boys' bodies begin producing a lot of the hormone testosterone, which causes changes in several parts of the body, including the voice. For starters, a boy's larynx, also known as the voice box, grows bigger, which causes your voice to get deeper. Along with all the other changes in your body, you might notice that your throat area looks a little different. For boys, when the larynx grows bigger, part of it sticks out in the part of the neck at the front of the throat and forms the Adam's apple. For girls, the larynx also grows bigger but not as much as a boy's. That is why girls don't have Adam's apples. While your body is getting used to these changes, your voice can be difficult to control. A guy’s voice "cracks" or "breaks" because his body is getting used to the changing size of his larynx. Fortunately, the cracking and breaking is only temporary. It usually lasts no longer than a few months. Generally, a boy's voice will start to change somewhere between the ages of 11 and 15 - although it can be earlier or later for some. Task 1. Read the text and identify whether the statements are true (T), or false (F). T F 1. A boy's voice gets deeper than a girl's because the boy reaches puberty.   2. The larynx may be responsible for creating the sound of your voice   3. When boys reach puberty, they only change in their voice.   4. Girls don't have Adam's apples because their larynx doesn't grow bigger.   5. We can't see Adam's apples of girls.   6. When boys reach puberty, they can't control their voice.   7. In general, boys don't have the same age of puberty.   8. The changes of voice often last a few months.  

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