1. Do...don't
2. Does....does
3.like
4.Do....do
5.Do...They

frog

brush

frisbee

read

queen

crown

dài quá ờ...

x - 4/9 = 1/2 + 1/3

x - 4/9 = 5/6

x = 5/6 + 4/9

x = 23/18

vậy x = ...

\(x-\dfrac{4}{9}=\dfrac{1}{2}+\dfrac{1}{3}\)

\(x-\dfrac{4}{9}=\dfrac{5}{6}\)

\(x=\dfrac{5}{6}+\dfrac{4}{9}=\dfrac{15}{18}+\dfrac{8}{18}\)

\(x=\dfrac{23}{18}\)

\(x-\dfrac{4}{9}=\dfrac{1}{2}+\dfrac{1}{3}\)

\(x-\dfrac{4}{9}=\dfrac{5}{6}\)

       \(x=\dfrac{23}{18}\)

Số kg thóc:

     120.100:62=\(\dfrac{6000}{31}\approx193,5\)(kg)

193,5 kg thóc

195.5 kg thóc

1 to finish

2 adding

3 to have

4 to do

5 to finish

6 working

7 writing

8 to complete

9 to get

10 to show

11 putting

12 to be

13 to email

14 to remember 

B4:

\(CTTQ:Na_xS_yO_z\left(x,y,z:nguy\text{ê}n,d\text{ươ}ng\right)\\ n_{Na}=\dfrac{4.6}{23}=0,2\left(mol\right);n_S=\dfrac{3,2}{32}=0,1\left(mol\right);n_O=\dfrac{4,8}{16}=0,3\left(mol\right)\\ x:y:z=0,2:0,1:0,3=2:1:3\\ \Rightarrow x=2;y=1;z=3\\ \Rightarrow CTHH:Na_2SO_3\)

Mình cần phải có tư duy, chớ nên phụ thuộc vào người khác quá nhiều nhé!

Bài 3:

\(CTTQ:Al_xS_yO_z\left(x,y,z:nguy\text{ên},d\text{ươ}ng\right)\\ x:y:z=\dfrac{15,8\%}{27}:\dfrac{28,1\%}{32}:\dfrac{56,1\%}{16}\approx0,0059:0,0087:0,0351\approx2:3:12\\ \Rightarrow CT\text{Đ}GN:Al_2S_3O_{12}\)

Nó cứ sai sai

Bài 2:

\(\text{Đ}\text{ặt}:N_xH_y\left(x,y:nguy\text{ê}n,d\text{ươ}ng\right)\\ M_{hc}=M_{H_2}.8,5=2.8,5=17\left(\dfrac{g}{mol}\right)\\ x=\dfrac{82.35\%.17}{14}=1\left(mol\right);y=\dfrac{17,65\%.17}{1}=3\left(mol\right)\\ CTHH:NH_3\\ b,n_{nguy\text{ê}n.t\text{ử}}=0,5.1+0,5.3=2\left(mol\right)\)

2 The meeting will be held before May Day

3 The engine of the car has to be repaired

4 A story is going to be told by the teacher

5 The cake is being cut with a sharp knife by Mary

6 Luckily for me, my name wasn't called

7 His story isn't believed

8 After class, the chalk board is always erased by one of the students

9 The victims have been provided with food and drink

11 Each of us were given 2 exercises books

12 He will be told that news

13 A lot of money was paid me to do the job

14 The window of the laboratory has been changed