Giải câu 9,10 hộ mk nha chỉ câu 9,10 thôi nha

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2 năm trước

Loga Sinh Học lớp 12

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saumuoinam6000

`9)`

`(1-3x)/(x+2)+2/(x-2)-(2+3x)/(x^2-4)`

`=((x-2)(1-3x))/((x-2)(x+2))+(2(x+2))/((x-2)(x+2))-(2+3x)/((x-2)(x+2))`

`=(x-3x^2-2+6x+2x+4-2-3x)/((x-2)(x+2))`

`=(-3x^2+6x)/((x-2)(x+2))`

`=(-3x(x-2))/((x-2)(x+2))`

`=(-3x)/(x+2)`

`10)`

`x/(x+1)-1/(x-1)-(2x)/(1-x^2)`

`=x/(x+1)-1/(x-1)+(2x)/(x^2-1)`

`=(x(x-1))/((x+1)(x-1))-(1(x+1))/((x+1)(x-1))+(2x)/((x+1)(x-1))`

`=(x^2-x-x-1+2x)/((x+1)(x-1))`

`=(x^2-1)/(x^2-1)`

`=1`

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ngapk83

$\frac{1-3x}{x+2}$ + $\frac{2}{x-2}$ - $\frac{2+3x}{x^{2}-4}$

=$\frac{1-3x}{x+2}$ +$\frac{2}{x-2}$ - $\frac{2+3x}{(x-2)^{2}}$

=$\frac{1-3x}{x+2}$ +$\frac{2}{x-2}$- $\frac{2+3x}{(x-2).(x+2)}$

=$\frac{1-3x}{(x+2).(x-2)}$ +$\frac{2.(x+2)}{(x+2).(x-2)}$-$\frac{2+3x}{(x-2).(x+2)}$

=$\frac{3x^{2}+7x-2}{(x+2).(x-2)}$

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Read the passage and then choose the correct option for each question. 1. Research shows that reading A. is more useful than other types of media. B. could help you write very well. C. is only useful when you read romantic stories. D. isn’t effective if your teacher chooses the book. 2. Sugata Mitra’s research showed that A. children from poor country are more motivated than others. B. it is not necessary to have a teacher to learn. C. children from poor countries prefer using computers to attending school. D. children can use the Internet better than a teacher. 3. Playing computer games probably won’t help you learn a language A. as much as using English in other ways. B. if you watch your friends play them. C. if you don’t play for a long time. D. if they have too much language content. 4. Doing a language course to help you prepare for an exam A. will not help you pass. B. is not as useful as reading if you want to do well. C. can help you pass as much as reading a book can. D. works if you read at the same time. 5. The main idea of the passage is that A. you shouldn’t go to school to learn a language. B. you can learn a language through self-study. C. it’s best to have fun to learn a language well. D. some learning activities are much more useful than others.

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