1.How much water in the bottle?

2.How far is it from the post office to Thong Nhat Park?

3.How does your brother go to work?

4.Which school is your sister in?

1. __Does__she play tennis every week ?

2. Lucy__ride__hẻ bicycle to work.

HELP ME! = GIÚP TÔI VỚI!

Quan sat kĩ một chất chỉ biết được ( thể, màu ).

Dùng dụng cụ đo mới biết được ( nhiệt độ sôi, nhiệt độ nóng chảy, khối lượng riêng ) của chất. Còn muốn biết chất có tan trong nước hay ko thì phải ( làm thí nghiệm ).

An ill-tempred man went to see the doctor.

-What wrong with you ? - the doctor asked.

-That is your duty to find out - the man said - That is why I came to see a doctor.

-In that case - the doctor said - I'd like you to sit in the reception room for about an hour. I want to call in a specialist. He's a vet, and he's the only doctor I know who can make a medical diagnosis without asking questions.

Ta có S=1-\(\dfrac{1}{4}\)+\(\dfrac{1}{4}\)-\(\dfrac{1}{7}\)+\(\dfrac{1}{7}\)-\(\dfrac{1}{10}\)+...+\(\dfrac{1}{43}\)-\(\dfrac{1}{46}\)

=1-\(\dfrac{1}{46}\)<1

=>S<1

(1-\(\dfrac{1}{2}\)).(1-\(\dfrac{1}{3}\)).(1-\(\dfrac{1}{4}\))...(1-\(\dfrac{1}{199}\))

=\(\dfrac{1}{2}\).\(\dfrac{2}{3}\).\(\dfrac{3}{4}\)...\(\dfrac{198}{199}\)

=\(\dfrac{1.2.3...198}{2.3.4...199}\)

=\(\dfrac{1}{199}\)

adam có 2 chữ a

eva chỉ có 1 a

**** cho mik di

1-​\(\dfrac{1}{12}\)-\(\dfrac{1}{20}\)-\(\dfrac{1}{30}\)-...-\(\dfrac{1}{210}\)

=1-(\(\dfrac{1}{12}\)+\(\dfrac{1}{20}\)+\(\dfrac{1}{30}\)+...+\(\dfrac{1}{210}\))

=1-(\(\dfrac{1}{3.4}\)+\(\dfrac{1}{4.5}\)+\(\dfrac{1}{5.6}\)+...+\(\dfrac{1}{14.15}\))

=1-(\(\dfrac{1}{3}\)-\(\dfrac{1}{4}\)+\(\dfrac{1}{4}\)-\(\dfrac{1}{5}\)+\(\dfrac{1}{5}\)-\(\dfrac{1}{6}\)+...+\(\dfrac{1}{14}\)-\(\dfrac{1}{15}\))

=1-(\(\dfrac{1}{3}\)-\(\dfrac{1}{15}\))

=1-\(\dfrac{4}{15}\)

=\(\dfrac{11}{15}\)