help me
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kiên trì thật
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đề bài là
2+1=???
ai thấy mình rảnh thì kb
đã biết nội quy
a nhanh đúng mình tick
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II
1 driver
2 participants
3 useless
4 electrician
5 building
6 variety
7 creative
8 poisonous
III
1 B => happy
2 C => between
3 B => seriously
4 A => excited
5C => to spending
6 B => ought to be
7 C => for
8 her => herself
IV
1 to buy
2 has been
3 will be going
4 to work
5 saw
6 to lock
7 don't know
8 are wasting
D Reading
1 T
2 F
3 T
4 F
II
1 to
2 Most
3 However
4 use
III
1 In Milton Keynes, a town about 70 kilometres northwest of London.
2 They can select their terminal, read the news, check e-mails or play video games.
3 No, they aren't
4 Yes, they are
Bài 3:
a: Theo đề, ta có hệ phương trình:
\(\left\{{}\begin{matrix}4a+b=3\\2a+b=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2a=4\\2a+b=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=2\\b=-1-2a=-5\end{matrix}\right.\)
= 28/15 . 3/4 - ( 11/20 + 1/4 ) : 7/3
= 28/15 . 3/4 - 4/5 : 7/3
= 7/5 - 12/35
= 37/35
= \(\dfrac{28}{15}\) . \(\dfrac{3}{4}\) - (\(\dfrac{11}{20}\) + \(\dfrac{1}{4}\)) : \(\dfrac{7}{3}\)
= \(\dfrac{7}{5}\) - (\(\dfrac{11}{20}\) + \(\dfrac{5}{20}\)) : \(\dfrac{7}{3}\)
= \(\dfrac{7}{5}\) - \(\dfrac{16}{20}\) : \(\dfrac{7}{3}\)
= \(\dfrac{7}{5}\) - \(\dfrac{16}{20}\) x \(\dfrac{3}{7}\)
= \(\dfrac{7}{5}\) - \(\dfrac{12}{35}\)
= \(\dfrac{49}{35}\) - \(\dfrac{12}{35}\)
= \(\dfrac{37}{35}\)
-13/25x9/17+13/17x8/25+(-13/25)
=-13/25x9/17+8/17x13/25+(-13/25)
=13x(-9/17+8/17-1)
=13x(-18/17)=-234
a) Ta có: \(\dfrac{-13}{25}\cdot\dfrac{9}{17}+\dfrac{13}{17}\cdot\dfrac{8}{25}+\dfrac{-13}{25}\)
\(=\dfrac{-13}{25}\cdot\dfrac{9}{17}-\dfrac{-13}{25}\cdot\dfrac{8}{17}+\dfrac{-13}{25}\)
\(=\dfrac{-13}{25}\left(\dfrac{9}{17}-\dfrac{8}{17}+1\right)\)
\(=\dfrac{-13}{25}\cdot\dfrac{18}{17}\)
\(=-\dfrac{234}{425}\)
3 nha bạn
dài quá
k cho mình
2 + 1 = 3
* Hok tốt !
# Miu