Ai giải giúp mik câu này với!
My parents(work).............eight hours a day
Cảm ơn ạ:333
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
1 Did you eat some / any rice ?
2 My father asked some information / informations about the new service
3 Some cats has / have got big ears
4 Have your parents got any free time / times ?
5 Can you see some / any clouds in the sky?
6 Tina has got some box / boxes
7 Does / Do any student leave their homework at home ?
1 . I read some / any books on my holiday
2 . Jim hasn't got any money / moneys for the ket
3 . Sam always buys some / any bread
4 . I didnt't put some / any salt into the soup yesterday
Bài làm:
Ta có: \(\frac{a}{b}=\frac{b}{c}\) => \(b^2=ac\)
Thay vào ta được: \(\frac{a^2+b^2}{b^2+c^2}=\frac{a^2+ac}{ac+c^2}=\frac{a\left(a+c\right)}{c\left(a+c\right)}=\frac{a}{c}\)
Vậy \(\frac{a}{c}=\frac{a^2+b^2}{b^2+c^2}\)
Đặt \(\frac{a}{b}=\frac{b}{c}=k\Rightarrow\hept{\begin{cases}a=kb\\b=kc\end{cases}}\Rightarrow a=k^2c\)
\(\frac{a^2+b^2}{b^2+c^2}=\frac{\left(k^2c\right)^2+\left(kc\right)^2}{\left(kb\right)^2+c^2}=\frac{k^4b^c+k^2c^2}{k^2b^2+c^2}=\frac{k^2\left(k^2b^2+c^2\right)}{k^2b^2+c^2}=k^2=\frac{a}{c}\)( đpcm )
1.It seems that our proposal has been accepted by him
2.It is ly that charges will be press against him
3.It seems that he has forgotten our appointment
4.It seems that your car has been taken by your brother without asking you first
5.Its ly that the school will expel John
6.It seems that she was trying to warn you
7.It seems that Sally lied about it all long
8.My mother will probably be angry when I het home
9.It seems that Mrs.White has got married again
10.My boss will probably resign next year
My parents work eight hours a day
My Parents (work) Work Eight hours a day
Chúc bạn hok tốt
:))