Cho 40 g CuO tác dụng vừa đủ với bao nhiêu gam dd H2SO4 9,8% , tính C%dung dịch sau phản ứng

In the early years of television, educational specialists believed that it would be very usefulin teaching and learning. Many schools have bought television sets, intending to use themeffectively to improve the quality of education; but actually they are not used properly inclassrooms. Meanwhile, children spending the majority of their out- of school hours watchingTV and their typical school days proceed as if television did not exist. There are someexplanations for the failure of television to get the interest of the teachers. Firstly, the schoolsthat purchased television sets have not set aside money for equipment repairs and maintenance sothese television sets are sooner and later out of work. Secondly, these schools have not found aneffective way to train teachers to integrate television into their ongoing instructional programs.Lastly, most teachers do not regard the quality of television and its usefulness in the classroom.Teachers at the schools work hard for at least twelve years to train their students to become goodreaders. However, according a recent statistics, teenagers seldom spend their free time readingbooks and newspapers but watching television instead. Câu hỏi: the word "it" in the first sentence is closest in meaning with A, early years B, educational specialists C, television D, quality of education Giải thích rõ giùm mk C hay D nhé

A=( $\frac{x-2}{2x+4}$ -$\frac{x+2}{2x-4}$ +$\frac{8}{4-x^2}$ ) và $\frac{4}{x^2-4x+4}$ a) Rút gọn biểu thức A b) Tìm C=$\frac{A}{B}$ c) Tìm x nguyên để A nguyên dương d) Tìm x để C>0 e) Tính giá trị của C khi |x|=$\frac{1}{2}$ Giúp em với ạ.Cảm ơn mọi người nhiều

Làm hộ mình nhé!!! Hứa vote 5 sao

Vẽ anime con vật đi :V Hoặc con người mà nhìn giống giống con vật :V

Câu 1 .Vị trí của con người trong tự nhiên

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1. No one in this class can speak English as fluently as Hoa Hoa speaks ... 2. I've forgotten that actor's name but he's very well-known. That actor,

1+3+5+7+...+97+99=?????????????????????????????????????????????????????????????????????????????????

cho xoy nhọn . từ điểm a thuộc tia phân giác góc xoy vẽ đường thẳng song song với ox cat oy o b a) tìm góc so le b chứng minh boa =bao