100 Miss white has a small oval face

Task 2

1 Mr and Mrs Brown are Peter's parents

3 How many classroom does Julia's school have?

mấy câu còn lại mk làm r

1 C => hers

2 B => will use

3 D => their

4 A => will be pedaling

5 A => travel

6 C => less

7 D => have they

8 D => than

9 A => worked

10 B => fewer

Ex1 ko có verb à

Ex2

1 like

2 listen

3 wears

4 teaches

5 do

6 goes

7 comes

8 goes

9 watch

10 walks

11 is

12 washes

13 studies

14 wants

15 plays

16 buys

17 studies

18 tries

19 washes

20 cries

21 says

22 flies

23 don't have

1 is

2 are

3 is

4 am

5 are

6 is

7 is

8 are

8 are

10 is

11 are

12 is

13 am

14 are

15 are

Bài 3:

1, Áp dụng t/c dtsbn:

\(\dfrac{x}{6}=\dfrac{y}{4}=\dfrac{z}{3}=\dfrac{z-x}{3-6}=\dfrac{-21}{-3}=7\\ \Rightarrow\left\{{}\begin{matrix}x=42\\y=28\\z=21\end{matrix}\right.\)

2, Áp dụng t/c dtsbn:

\(\dfrac{x}{3}=\dfrac{y}{5}=\dfrac{z}{7}=\dfrac{2x+3y-z}{6+15-7}=\dfrac{-14}{14}=-1\\ \Rightarrow\left\{{}\begin{matrix}x=-3\\y=-5\\z=-7\end{matrix}\right.\)

Bài 4: 

Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:

\(\dfrac{x}{\dfrac{1}{2}}=\dfrac{y}{\dfrac{1}{3}}=\dfrac{z}{\dfrac{1}{4}}=\dfrac{x+y+z}{\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}}=\dfrac{130}{\dfrac{13}{12}}=120\)

Do đó: x=60; y=40; z=30

giúp mk bài 4 với ạ

mở bài là giới thiệu về cụ nha mn em viết lộn ạ 

thân bài là đóng góp ạ 

Câu 6:

a: =12x^2+4x-3x-1-5x^2+15x-x^2+7x-12

=6x^2+23x-13

b: =5x^2+5x-2x-2-3x^3+3x^2+9x-2x(x^2-9x+20)

=-3x^3+8x^2+14x-2-2x^3+18x^2-40x

=-5x^3+26x^2-26x-2

bằng -49/10 nha bạn!

b=5/46

\(a,3,5.\left(-1\dfrac{2}{5}\right)=\dfrac{7}{2}.\left(\dfrac{-7}{5}\right)=\dfrac{-49}{10}\)

\(b,\dfrac{-5}{23}:\left(-2\right)=\dfrac{-5}{23}.\dfrac{-1}{2}=\dfrac{5}{46}\)

Hôctot