Làm hộ mk bài 7, 8, 9 với 
K
Khách
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C
20 tháng 4 2022
\(\dfrac{7}{5}+\dfrac{4}{7}-\dfrac{9}{10}=\dfrac{49-20}{35}-\dfrac{9}{10}=\dfrac{19}{35}-\dfrac{9}{10}=\dfrac{190-315}{350}=\dfrac{-125}{350}\)
\(\dfrac{2}{1}+\dfrac{3}{4}\text{×}\dfrac{8}{5}=\dfrac{8+3}{4}\text{×}\dfrac{8}{5}=\dfrac{11\text{×}8}{4\text{×}5}=\dfrac{88}{20}\)
mấy câu kia áp dụng là dc!
28 tháng 10 2016
\(\sqrt{51-7\sqrt{8}}=\sqrt{7^2-7.2\sqrt{2}+\left(\sqrt{2}\right)^2}=\sqrt{\left(7-\sqrt{2}\right)^2}=7-\sqrt{2}\)
(vì\(7=\sqrt{49}>\sqrt{2}\Rightarrow7-\sqrt{2}>0\))
27 tháng 2 2022
Câu 8
a, \(\dfrac{4}{5}+\dfrac{3}{8}+\dfrac{1}{4}=\dfrac{16.4}{80}+\dfrac{30}{80}+\dfrac{20}{80}=\dfrac{64+50}{80}=\dfrac{114}{80}=\dfrac{57}{40}\)
b, \(\dfrac{5}{9}+\dfrac{2}{3}+\dfrac{1}{2}=\dfrac{10}{18}+\dfrac{12}{18}+\dfrac{9}{18}=\dfrac{22+9}{18}=\dfrac{31}{18}\)
BN
0
16 tháng 9 2016
1. go / her / we / birthday / will / to / party
=> We will go to her birthday party
2. be / on / May / Lan / will / Sunday / 20th / thirteen.
=> Lan will be thirteen on Sunday 20th
3. will / her / call / six / after / I / again / o'clock
=> I will call her again after six o'clock
4. speak / can / to / I / Mai / please?
=> Can I speak to Mai please?
5. telephone / your / is / number / what?
=> What is your telephone number?
6. morning / will / free / you / be / tomorrow?
=> Will you be free tomorrow morning?
7. weekend / think / will / the / free / on / I / I / be
=> I think I will be free on the weekend.
8. of / invite / friends / some / will / she / her.
=> She will invite some of her friends.
NM
2
bài 7
Bài 8
Bài 9